Tue, 18 Jun 96 10:48:44 +0200
[Next of thread] [Next by author] [First of thread] [First by author]-------------------------- DEMING QUESTIONS -------------------------- A weekly paper including a set of questions copied in the Deming book OUT OF THE CRISIS Chapter 5. Questions to Help Managers. By Jean-Marie Gogue ----- # 17 ----- 1. (No 33 in the Book) - Knowledge about your customers' relations with your services a) Do your customers think that your product lives up to your expectations? What did your advertising and your salesmen lead your customers to expect? More than you can deliver? How do you know? b) (If applicable.) Are your customers satisfied with the service that you or your dealers provide? If yes, what is satisfactory about it? The quality of workmanship? The lag between your call and appearance of the serviceman? How do you know? COMMENTS Page 179 of Out of the Crisis we read : "In the olden days, before the industrial era, the tailor, the carpenter, the shoemaker, the milkman, the blacksmith knew his customes by name. He knew whether they were satisfied, and what he should do to improve appreciation for his product... With expansion of industry, this personal touch is easy to lose... But sampling, a new science, steps in and pierces that barrier." Dr. Deming said that in front of an audience of 24 Japanese top managers in Tokyo, July 1950. We know that this historical conference (the text is available) was the spark which started the Japanese industrial revolution. The Japanese chief executives understood the Dr. Deming's message. Listening to the Voice of the Customer is everybodie's job. Sampling techniques can help. The American chief executives did not understand the Dr. Deming's message. They believed they had to create new categories of specialists (Quality Control, Marketing etc.). Wrong. 2. (No 34 in the Book) - Everybody sees the quality of your product with his own eyes a) How do you distinguish between your quality as your customer perceives it and quality as your plant manager and work force perceive it? b) How does the quality of your product, as your customer sees it, agree with the quality that you intended to give him? COMMENT Pretty good questions ! ---------------------------------------------------------------------------- Jean-Marie Gogue President The French Deming Association Versailles France gogue@ensmp.fr ===========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 19 Jun 1996 14:17:29 -0400 (EDT)
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Mea Culpa to those that tried the web addresses I sent yesterday.
When I wrote the URL down, I changed rampages to rampage.
^
Adding the 's' back in fixes it:
http://rampages.onramp.net/~dumont/perapp1.htm
^
http://rampages.onramp.net/~dumont/perapp2.htm
^
Sorry for the inconvenience.
Your red-faced moderator,
Jim Clauson
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Wed, 19 Jun 1996 18:35:01 +0100
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I would like ideas about a very important practical problem. I am sure
we must all have met people who respond to a Deming idea, not with
surprise, or disbelief, but with aggression. Surprise and disbelief
are easy to understand, and probably hopeful. If you jump uncritically
at a new idea, you are hardly likely to understand it. But some people
seem to see the new ideas as a threat.
I taught Statistics for many years, where some of the concepts are
difficult, and there have been many bitter arguments, for example about
the nature of probability. So the problem is not confined to the Deming
Philosophy, but it raises more than usual. Typical examples are
performance appraisal, targets, competition, pay-for-performance.
So, following the SPK, I need a theory, or theories, about the reasons
for this agression, in the form of predictions about ways to avoid it:
if, that is, it is a good thing to avoid it.
The greatest heat often comes from consultants or academics: they may
feel that their livelihood is threatened if they have to admit to having
been wrong. I would feel threatened if I did not keep finding I had been
wrong, because it would mean I had stopped learning. But the "threat"
theory may be wrong.
Ideas please:
Our overiding aim, it goes without saying, is to spread understanding
and application of the Deming Philosophy. So:
1) Is an aggreesive response a sign that we are making progress, or
an obstacle to progress?
2) If it is an obstacle, how can we present the new ideas effectively
without causing an aggressive response?
David Kerridge
British Deming Association Scotland
dfk@abdn.ac.uk
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Wed, 19 Jun 1996 18:26:59 -0400
[Next of thread] [Next by author] [First of thread] [First by author]At 06:35 PM 6/19/96 +0100, David Kerridge wrote: >1) Is an aggreesive response a sign that we are making progress, or > an obstacle to progress? An aggressive response is most definitely a sign of progress - it means the respondent has heard the message, and even if (s)he doesn't immediately agree with it, the seed has been sown. Any emphatic response, positive or negative, is preferable to a shrug and a change of subject. >2) If it is an obstacle, how can we present the new ideas effectively > without causing an aggressive response? Even if aggression is not an obstacle, effective communication is vital. The concepts of pay-for-performance, quotas, striving to be #1, etc., are 'motherhood' issues to many people, and we must be sensitive to that. One way to attack them would be to engage the doubter in a discussion about a common topic centered around one of the 'motherhood' issues. Take athletic events, for example. If a particular runner wins a particular race, does that mean that he is the fastest in the world? Can anyone guarantee that the same runner would win on the next day, too, while competing against the same group of runners? Why not? (Come to think of it, the upcoming Olympics are very fertile ground for debating Deming's ideas). Another way is to sow the seeds of doubt by attacking one of the issues 'head on' and putting up with an aggressive response. A few months ago, I tested the receptiveness of Deming's views on commission sales and other pay-for-performance incentives on a friend who is a commission salesman (with an MBA). Needless to say, he was aghast. As an example of 'effective motivation', he told me about an acquaintance of his who used to work at a car dealership where every month, the owner would fire the salesperson with the lowest sales - just to keep the sales force motivated. When I mentioned the success of some recently opened 'no dicker' dealerships where the sales staff are on salary, he dismissed them as a 'totally different class of operations'. Just yesterday, however, he was talking about leaving his current employer because even though he will have met his annual quota in about two weeks, and he will end up getting a large bonus at the end of the year, he would like to work for a company that pays a higher base and a lower commission, 'just to have more stability during the year'. I bit my tongue. Obviously, he recognizes the benefit of Deming's ideas, although not yet on a conscious level. But the seed has sprouted! These are just a couple of suggestions. I'm looking forward to seeing more - just as I'm trying to learn Deming's teachings and relate them to my experiences, I'm often in a position of having to explain them to others, so this debate will be very beneficial. Alla Linetsky ===========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 19 Jun 1996 16:48:02 -0700 (MST)
[Topic List] [Next by author] [First of thread] [First by author]On the 17th, Patrick Owings wrote: > The Deming philosophy represents a sensible alternative to the ignorant, > half-baked, hypocritical nonsense of political ideology - Democrat, > Republican, Independent, or anything else you care to name. Patrick: I was interested in your conclusions and thoughts on the question of politics and Deming. Should we start a Deming political party? :) Actually, the "ignorant, half-baked..." political ideologies also constitute a system, and are probably a system that is not very self- aware. This is why so many people get elected promising to "change the system" in Washington, but never really seem to achieve very much. The main statistics of interest within that system would seem to be opinion polls rather than control charts. Robert Crow's recent post on the June Atlanta group's meeting was intriguing because it suggests that at least there is a semblance of change occuring at the state level with regard to the quality movement and transformation. It will be interesting to see how far it goes. I would be interested to know how many state legislators or federal legislators are even aware of Deming's name or contributions? I guess one of my conclusions on this subject would be that unless and until we are able to achieve wide-spread consideration and application of Deming's teachings among the general population, the political system is unlikely to change. Even with that base, it would constitute a massive culture shift to see results. That does not mean it is not worth doing...... ________________________________ Anton O. Tolman, Ph.D. Director, Psychological Services Director, Program Services Wyoming State Hospital P.O. Box 177 Evanston, WY 82931-0177 Anton@wsh.state.wy.us (307) 789-3464 --------------- =======================================================================[Topic List] [Next by author] [First of thread] [First by author]
Thu, 20 Jun 1996 08:30:27 -1200
[Next of thread] [Next by author] [First of thread] [First by author]In response to an interesting post by David Kerridge: David answered his own question with the following comment: > I would feel threatened if I did not keep finding I had been > wrong, because it would mean I had stopped learning. But the "threat" > theory may be wrong. Were the Deming Philosophy to be blindly accepted by all, it would not be challenged (aggressively or otherwise). Without challenge, even continuous improvement would slow (and radical or major, non-incremental change would be lost). Thus: > 1) Is an aggreesive response a sign that we are making progress, or > an obstacle to progress? Yes, this is both: Progress results from overcoming obstacles, which must first be encountered and recognized. Alcoholics Anonymous works on this principle: You're half way to solving your problem by admitting that you have a problem. In our case, identifying the challenges (aggressive responses or respondents) allows us to address the issues and the issuer, which will benefit not only our understanding of the Deming philosophy but hopefully also the challenger's. > 2) If it is an obstacle, how can we present the new ideas effectively > without causing an aggressive response? Perhaps our goal should be to stretch, in some instances, to the point where we do provoke aggressive responses. My suggestion would be that we choose when and where to fight, instead of allowing this to be at the discretion of the sparring partner... - Andre' M. Everett (PhD), Advanced Business Programme, University of Otago - ------ Box 56, Dunedin, New Zealand; tel 64 3 479 8047/8046; fax 8045 ------ ---------------------- aeverett@commerce.otago.ac.nz ------------------------ ==========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 19 Jun 1996 09:43:40 -0700
[Topic List] [Next by author] [First of thread] [First by author]I just finished Four Days with Dr. Deming, by William J. Latzko and David M. Saunders. A very nice read. I've read the two last books by Dr. Deming and several others about him, but Four Days is separated not only by its reader-friendly layout but also by the various points of view offered of the seminar: wonderings of the fictional executive attendant, interpretations and emphases by the authors, and quotes of Dr. Deming. The epilogue offers a flowchart giving guidance on implementatng Deming's ideas, information on where to get help, and questions for discussion. I believe Mr. Latzko is a DEN list member. Congratulations on a wonderful job. It was a great learning experience for me. I suppose this list has discussed his book before this, but if anyone has not read it, it is solid. -- Don Clarke U.S. Geological Survey clarke@usgs.gov ==========================================================================[Topic List] [Next by author] [First of thread] [First by author]
20 Jun 96 17:19:18 EDT
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David Kerridge asked:
>>1) Is an aggressive response a sign that we are making progress, or an
obstacle to progress?
2) If it is an obstacle, how can we present the new ideas effectively
without causing an aggressive response?<<
In my own experience I have found resistance to change to be useful. In a
'Darwinian' sense, the more aggressive and powerful the resistance, the more
elegant, persuasive and powerful I have been invited to make my response, if it
is to 'survive'.
The extremely strong challenges to the Deming philosophy that I have met at work
have prompted me to go away and really sort my thoughts/arguments out.
Alberto Knox in 'Sophies World' (page 283) says:
Theres no need to have an opinion on something everyone agrees on.
The very best that can happen is to have energetic opponents. The more extreme
they become, the more powerful the reaction they will have to face.''
''The many men in Hegel's time who could reel off gross broadsides like the one
on the inferiority of women hastened the development of feminism. They produced
a thesis. Why? Because women had already begun to rebel. And the more grossly
they expressed themselves about women's inferiority, the stronger became the
negation.''
I see an aggressive response as a sign of progress, as an invitation to present
Deming's philosophy more elegantly, patiently, professionally and convincingly.
This benefits everybody.
I do not see it as an obstacle. Rather than looking for ways of presenting the
new ideas effectively without causing an aggressive response, I would welcome an
aggressive response as a way of discovering how to present the ideas more
effectively.
David Young
100654.3270@compuserve.com
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"""""""""""""""""""""""David Kerridge wrote"""""""""""""""""""""""""""
I would like ideas about a very important practical problem. I am sure
we must all have met people who respond to a Deming idea, not with
surprise, or disbelief, but with aggression... But some people
seem to see the new ideas as a threat.
""""""""""""""""""""""""""""end quote"""""""""""""""""""""""""""""""""
I hope no one thinks such a reaction is unique to Deming ideas. Many
people react to ANY new idea as a threat. In part, this is because
they are accurately perceiving the situation. And it should surprise
no one that many people react to threats by demonstrating "aggressive"
behavior which is not really aggressive at all, but profoundly
defensive.
""""""""""""""""""""""""another Kerridge comment""""""""""""""""""""""""
The greatest heat often comes from consultants or academics: they may
feel that their livelihood is threatened if they have to admit to having
been wrong. I would feel threatened if I did not keep finding I had been
wrong, because it would mean I had stopped learning. But the "threat"
theory may be wrong.
"""""""""""""""""""""""""""""""end quote""""""""""""""""""""""""""""""""
First, please entertain the possibility that there may be other
paradigms than your own: that is, that people may react strongly, not
simply because they perceive their livelihoods threatened, but because
a cherished value -- not necessarily an economic one, but perhaps one
in which their personal identity is wrapped up -- is threatened.
"Threatened," that is; not "challenged" or "examined" or "engaged."
Academics, in particular, often see the world in wildly diverse ways.
A behaviorist or quantification paradigm may itself be inconsistent
with broader reality as a humanist philosopher sees it, and any
attempt to impose it upon a community of free thinkers may be seen --
not in terms of the idea and its merits but in terms of the threat of
its being imposed -- as destructive to the very concept of academic
integrity. This should not be surprising to Deming followers, who more
than most others, should understand the importance of paradigmatic
thinking, for better or for worse.
Second, please recognize that ideas do not get communicated in a
vaccuum. They come wrapped in context, and presented in an
environment. For example, an idea I'm encountering a lot now is that
anything which smacks of TQM is simply a tool of administrators to
amass all power in their own hands while giving the appearance of
participatory management; thus, TQM does nothing but legitimze an
illegitimate thing. It's a trick to make it look like "we" are
cooperating in our own destruction, while shielding those who REALLY
make the decisions from the consequences of their decisions, and
directing those consequences toward those whose participation was
visible but minimally significant. Absent a context of trust, almost
ANY new idea will probably be taken to be "just another trick," or, to
quote a common phrase "BOHICA: Bend Over, Here It Comes Again!" This
is, of course, mostly a problem of a pre-existing system, but when are
ideas NOT presented in context of an existing system? Seldom can we
really build on truly virgin ground.
As for the environment, that's a related problem. An idea which might
be easily accepted as at least a subject for debate in one time might
be summarily rejected in another. Some issues are too hot to handle in
some environments, and not a problem at all in others. The present
environment in which academics work is one of increasing political
intrusion into academics. The justification for these intrusions is
usually phrased with terms like "accountability," "performance
standards," "objective criteria," and even "TQM." To debate seriously,
and thus to lend scholarly credence to, such issues simply plays into
the hands of those who are attempting to effect the intrusion. The
mere fact that the issue is considered open for discussion at such a
level is taken as evidence that it's valid, and therefore that the
intrusions are themselves justified. Even where there is relative
trust within an organization, and where what I described above as
"context" does not enter in, the question of "whether this is the
thing to do in this environment" must enter.
A couple of examples: a few years ago, some of the faculty at my
institution objected to the fact that prayers -- always Christian
prayers, though probably by default rather than by intent -- were part
of university ceremonies which faculty were required to attend. Our
faculty contains Jews, Muslims, a Hindu, a Bahai, and a large number
of people without any particular religious orientation, plus a large
number of devout Christians who object on religious and philosophical
grounds to breaching the separation of church and state. Was it not a
violation of individuals' religious freedom to compel attendance at
functions of which religious services not consistent with their own
values were a part, particularly when the ceremony was not that of a
church, but of the university which supposedly contains us all?
Only a few people -- all anti-separationist Christians -- objected to
the idea of doing away with prayers in and of itself (though there
were many who wanted to keep the prayers, but chose to vote for doing
away with them out of respect for their fellows who believed
otherwise.) This IS, after all, a public institution. But this is also
South Carolina, and religion is a hot political issue just now. The
Christian Coalition, as a matter of fact, has won control of the
state's Republican Party, and controls many, if not most, of the
county organizations too. What would be the effect of public support
for higher education in the state, and of legislative support for
appropriations for higher education, if we were to take such a step,
and let ourselves be branded "anti-Christian" in the media and in the
public mind? Indeed, what would happen if the media in this region
discovered that we were even discussing the issue? Further, the state
government was conducting some highly-charged investigations into
higher education and the means of funding it. Was this the time even
to breathe such an idea? Opposition was strong and yes, even
"aggressive." But the opposition was based, not on resistance to the
idea itself, but to fear of the consequences of consideration of the
idea in this particular environment.
Another example: perhaps it would be a good idea to keep track, even
statistically, of what people actually do with their days. But right
now, our legislature has mandated that institutional funding no longer
be based upon enrollments, but upon meeting certain "performance
standards." One of these is "faculty workload." No one knows just how
that will be defined, but the strong fear is that those who made the
law, and have no idea what goes into being a faculty member, will be
expecting some time-clock-like system which would probably be
destructive of the entire way higher education is done. While
reviewing the way higher education is done certainly might be in
order, it should come from serious study on its own, and not be
imposed by default and through the back door. Thus, why now make
available information which will probably be fed into what is already
a threatening development? Why not wait until the cloud passes, or
until it's already upon us anyway, and do it when we can benefit from
it more than we'll be threatened by it? The environment makes what
could be a neutral or even a welcome idea into a threat.
I think all these things need to be considered.
More basically, people can respond vigorously to new ideas because
they really ARE a threat. No, David, it's not necessarily that people
are afraid to find out that they've been wrong. It's that they're
afraid to permit any method which would enable to boss to prove that
they've been wrong, and thus to justify their firing. Where the system
provides security, not for excelling, but for not screwing up, the
most important imperative is to avoid the impression that you've
screwed up. Here, you can't learn from your mistakes, because if you
acknowledge the mistake, you're fired! Further, even though the boss
may have the impression that you've screwed up, many present systems
still prohibit his doing anything about it unless he can PROVE it. A
new idea which offers means of proving it simply puts a gun into the
hands of the man who's already trying to kill you. "Doing it better"
is a luxury for the secure. "Doing it differently" destroys security.
What do you expect? "Doing it better" may be essential for
institutional survival, but destructive of individual security. The
way the system is set up will have a lot to do with whether that
contradiction exists, and with which side of it will prevail.
Recent postings comparing Deming to Maslow have a point, I think.
Unless fear is first cast out, new ideas will be received in an
atmosphere of fear and distrust. So, David, perhaps your problem is
not that you're presenting a Deming idea, but that you're presenting a
Deming idea out of sequence. Perhaps another Deming idea needs to come
first.
I know it's not for a tyro like me to say something like this,
particularly to someone like you, but I'm going to say it anyway: it
IS important to consider the system, and not simply the reactions of
individuals within the system.
""""""""""""""""""""""""""""David then asked"""""""""""""""""""""""""""""
1) Is an aggreesive response a sign that we are making progress, or
an obstacle to progress?
"""""""""""""""""""""""""""""""""""end quote""""""""""""""""""""""""""""
Could be either, neither, or both. See above.
""""""""""""""""""""""""""""""and finally"""""""""""""""""""""""""""""""""
2) If it is an obstacle, how can we present the new ideas effectively
without causing an aggressive response?
"""""""""""""""""""""""""""""end quote""""""""""""""""""""""""""""""""""""
Consider presenting them in sequence, with an eye toward context,
environment, and SYSTEM. Unless fear first be case out, and trust
instilled, all new ideas will appear at least mildly unsettling, and
probably severely threatening. And most people don't respond well to
threats.
Tom Powers
Professor of History
The University of South Carolina at Sumter
TPOWERS@USCSUMTER.USCSU.SC.EDU
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Thu, 20 Jun 1996 21:03:36 -0500
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I would like to thank Tom Powers for an excellent discussion of a
problem which we all face from time to time. An excellent book on this
subject is "Excape From Freedom," by Erich Fromm.
In this book Fromm examines Germany's move from democracy to a totalitarian
state in the twenties and thirties. The German's in power at the time
thought they could control Hitler. They were wrong. Another excellent book
by Fromm is "Man For Himself." An inquiry into the psychology of ethics.
Here is a short discussion from that book on the use of power.
"Productiveness is man's realization of the potentialities characteristic of
him, the use of his powers. But what is "power"? It is rather ironical
that this word denotes two contradictory concepts: Power of = capacity and
power over = domination. This contradiction, however, is of a particular
kind. Power = domination results from the paralysis of power = capacity.
"Power over" is the perversion of "Power to." The ability of man to make
productive use of his powers is his potency; The inability is his impotence.
With his power of reason he can penetrate the surface of phenomena and
understand their essence. With his power of love he can break through the
wall which separates one person from another. With his power of imagination
he can visualize things not yet existing; he can plan and thus begin to
create. Where potency is lacking, man's relatedness to the world is
perverted into a desire to dominate, to exert power over others as though
they were things. Domination is coupled with death, potency with life.
Domination Springs from impotence and inturn reinforces it, for if an
individual can force somebody else to serve him, his own need to be
productive is increasingly paralyzed."
I have been using this for about 25 years as a management development tool.
It ties in well with McGreggor's theory X, theory Y. How do you look at
your position in management, and the power associated with that position?
How would you concept of you position and of people affect your behavion and
the leadership you provide? This also ties in well with Deming's point
number 8. "Drive out Fear."
Ideology is the enemy of mankind. I would include in that all the "ism's",
religion, political parties etc. Once we become attached to a particular
thought pattern it clouds our vision. The world becomes black and white
instead of shades of gray. It affects our ability to see other people as
human beings, and thus robs us of our humanity. We lose our ability to
think objectively, and it becomes a struggle of us vs. them.
On the subject of liberal vs. conservative. I have been keeping up with
that discussion, and I do not believe I have seen an operational defination
of either term. Since we have not arrived at any kind of consensus on what
these two words mean can we perceed with that discussion? Do we want to do
that anyway because we will be getting into the area of personal values, and
Harry Truman said, "Two intelligent people never agreed about anything."
Robert Crow
President, The Crow Group
jr1crow@mindspring.com
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Thu, 20 Jun 1996 21:03:33 -0500
[Next of thread] [Next by author] [First of thread] [First by author]>To: den.list@deming.ces.clemson.com >From: jr1crow@mindspring.com (James Robert Crow) >Subject: Aggresive Response to New Ideas >Cc: >Bcc: >X-Attachments: > > Generall when we hear something for the first time, or we hear something that is totally different from what our understanding of a subject has been there is a tendancy to reject it out of hand. The first time I heard that Deming was opposed to performance appraisals and pay for performance I wondered just how old this guy was and where he had been. Anybody knows that these two practices are the cornerstone of any modern human resource program. > > However having implemented two of these programs, one for a Fortune 200 company and another for a high tech Japanese company I was aware of the problems we experiences during the implementation and afterwards, so possibly I was a little more receptive than the average bear. > > Quite frankly I am taking an agressive posture on these subjects. I am looking for people who can give me good arguments for the continuation of appraisals, pay for performance, and quotas. The reason is that I am concerned that I don't know as much as I think I know. I am concerned that I will get blind sided, by something I did not think about. By continually testing my knowledge base I can learn, and just possibly make a few converts in the process. > > In March the local chapter of AQP sponsored a debate between myself and another person on the subject of performance appraisals and pay for performance. This was a fairly well attended meeting and the group got to hear both sides of the issue. I think for most of them it was the first time they had heard anyone attack these two sacred cows. > > As a result of this debate the editor of HR Atlanta, circulation 7000, has asked both of us to write a position paper, which will be published in an upcoming issue. I don't back down from discussing this subject with anyone. I am looking for people to shoot holes in my positions. This gives me a way to continually test what I think I know. > > I recently made a presentation to a group in Atlanta on the subject of why TQM fails and what to do about it. I asked the group to give me their feelings on the subject and then we worked with what they came up with. I also cited a study I did several years ago of companies in the Atlanta area and their implementation efforts. One of the conclusions was that "Not taking a system approach was a major cause of failure. > > As you know one element of a system is interdependence. During this discussion we talked about performance appraisals, pay for performance, and reward systems, and how they ignored the existance of a system and in fact resulted in sub-optimization. One of the participants, a consultant, recently retired from IBM, wasn't buying any of it, even though the group as a whole could see the point and agree with it. > > We then did the Green M&M exercise which I have developed as a substitute for the Red Beads exercise. A part of the exercise is that I reward, and punish performance. His group performed outstanding the first round and each person earned a production bonus. (a penny). >The second round they did not do well and I questioned their dedication, ability to follow procedures, etc. The third round they did well again and when I approached them with their production bonus, this person said, "Get out of here with your bonus." Even he could see that the bonus was meaningless. The system was controlling perfromance. This made a much stronger point than I could have ever made in a verbal argument. > > Adults learn by doing. If you can incorporate some exercises in you presentation which allows the group to expericenc the power of the system on performance, the difference between competition and cooperation, and the difference between motivating forces, and dissatisfiers in a work environment the group will begin to pick up on the idea and will work to convert doubting Thomases. It is more powerful if you can discipline yourself to keep you mouth shut and allow the group to do the work. This is hard to do. I think I was much better at this before I thought I knew so much. > > > Robert Crow President, The Crow Group jr1crow@mindspring.com =======================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 21 Jun 1996 07:06:00 -0700
[Topic List] [Next by author] [First of thread] [First by author]The following is a list of Team members for the Renewing American Civilization Review (RACR) Project. The DEN RACR Team will review Speaker Newt Gingrich's lectures on his foundational principles necessary to the renewal of American Civilization. The transcripts from a series of 10 lectures can be downloaded from http://www.pff.org/pff/i-renew.html. The team will then develop a DEN-based feedback response. Our purpose is to open up a dialogue with Speaker Gingrich with the hope of improving his and our understanding of the Deming Philosophy and The System of Profound Knowledge. We believe our collective contributions will make a difference in truly Renewing American Civilization. The purpose of this DEN post is to complete the Team Formation phase by June 28. which will be followed by a brief off-line team planning and scheduling phase. The first team lecture review will begin the first week of July. If you would like to be a vital part of this team (no citizenship or credentials required) please let me know directly at the following address: donald.kerr@alliedsignal.com The DEN RACR Team John Hunter -- wdsg@aol.com Wayne Levin -- levin@astral.magic.ca Anton Tolman -- anton@wsh.state.wy.us Ian Bradbury -- lnuspth1.rzyj8c@gmeds.com Jonathan Siegel -- jmseigel.info.research@worldnet.att.net Matt Barkley -- mbbjr@vnet.ibm.com Patrick Owings -- owingsp@msn.com Rip Stauffer -- ripstaur@aol.com John Seddon -- 101454.573@compuserve.com Stan Adams -- sadamstimd@aol.com Myron Tribus - 104055.2663@compuserve.com John Paul Fullerton - jpf@myriad.net Bill Cooper - BCoop1116@aol.com Don Kerr - donald.kerr@alliedsignal.com I would like to thank each of you for volunteering. This is going to be a Great Adventure! Don Kerr P.S. I guess a "Speed Racer" metaphor would be silly...so what! Go DEN RACR!...Go DEN RACR!...Go DEN RACR...Gooooo! P.S.S. To the team...go ahead and start reviewing and making notes on the "Quality as defined by Deming" lecture. Matt suggested we start there and work out to the others...sounds good to me. Also, double check you addresses. thanks. ====================================================================[Topic List] [Next by author] [First of thread] [First by author]
Fri, 21 Jun 96 13:02:59 UT
[Next of thread] [Next by author] [First of thread] [First by author]Tom Powers' recent comments are very enlightening. As I reflect on my own situation, I can see (I believe) what, in part, may be necessary for the Deming Philosophy to become accepted in an organization. I met Dr. Deming in 1991, in Greenville, South Carolina, at one of his Four Day Seminars. At the time, I really knew very little about him, but as the seminar progressed and I had the opportunity to meet and talk with Gipsie Ranney, and others, I became awe-struck. I remember remarking to my operations manager who was attending with me that being in the same room with Dr. Deming was akin to being in the same room with God, i.e., an overwhelming, humiliating experience. I remember a chance meeting with Dr. Deming in the corridor one evening. I struggled to say something intelligent to the man, but all I could do was stand there with my mouth open and no words coming out. I'm sure he passed by without even knowing I was there. When I returned home Dr. Deming's books collected dust while I struggled to run my company. It wasn't until I returned to school in an Executive MBA program that I began pursuing the Deming Philosophy with a purpose. On more than one occasion, I became very angry at some of my professors because they in essence dismissed Dr. Deming's theories in favor of your traditional MBA approach to things, i.e., highly analytical (think about as opposed to synthesis and Russell Ackoff's teaching). Fortunately, one of my professors had received his Ph.D. under Ackoff at Wharton and he encouraged me to continue my pursuit. I also have an engineering degree, so I have nothing against being analytical, nor do I have anything against MBAs. What I do have a problem with is the way we are all taught to think in most business schools. After finishing my MBA program, I had the time to pursue major change within my company. Since I am at the top of my own company, I did not have to be as concerned about strong opposition to my desire to operate the organization using the Deming Philosophy. I simply made it very clear that we were going to do it together. The first year I spent 250 hours with top and middle management and first line supervision, together in a classroom setting, teaching them the Deming Philosophy. I made it clear that no one would be fired or chastised for questioning or criticizing anything we were learning. I made certain that I personally protected first line supervision from middle management, and middle management from top management. All were encouraged to come directly to me with their concerns. We have developed an open, unafraid dialog where ideas and concerns are addressed honestly and without hidden agendas (they soon surface). The results are astounding and have even been observed by our customers as representing dramatic improvement in our company's service and performance. There is much more to this story and I will have to continue at a later date. The point is (yes, there is a point) that the leadership at the very top must be converted because THAT is where the problem is. Patrick Owings ==========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 21 Jun 1996 12:00:28 -0400
[Next of thread] [Next by author] [First of thread] [First by author]I was wondering if any one could comment on the inability of the p-, np-, u-, and c- charts to provided information on the "flattness" of a system's variation. The spread of variation in these charts is a always a function of sample size, if I understand correctly. It seems to me that there may be quite a bit of difference between a system that produces defects in a narrow band and a system that produces defects in a larger (although with the limits predicted by p-, et al charts) band. Unlike x-Bar and X/moving R, these charts (p-, et al) do not seem to imbed within the calculation of limits information about how one data point varies from the next. I'm not sure about this, but it seems that the underlying assumption of the p-, et al charts is that individual data points are _independent_ of the prior and the next (like the hypothetical fair coin toss). How does this rub against the idea of SYSTEM. In the context of the red beads and using the data from TNE example, won't an Ind. X/ moving R chart provide essentially the same results? Comments? John D. Kromkowski Attorney at Law The Jefferson Bldg. -- Suite 103 105 W. Chesapeake Ave. Towson, MD 21204 Tel. 410 821-6116 Fax. 410 828-0705 also Kromkowski@aol.com ====================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 21 Jun 1996 12:00:29 -0400
[Next of thread] [Next by author] [First of thread] [First by author]Notwithstanding some of the fuzziness about the aim of DEN, and fully cognizant of the issue of destruction of a system, I was wondering if a more systematic approach to "Subject Lines" of posts might be helpful. Specifically, I would suggest that Subject Lines follow the following format: SYSTEM - unique desc. VARIATION -unique desc. PSYCHOLOGY - unique desc. THEORY OF KNOWLEDGE - unique desc. ANNOUNCEMENTS -unique desc. OTHER - unique desc. Obviously, OTHER in time and after consideration my Moderator might be expanded. Having these categories might help us identify what gets discussed and what doesn't. John D. Kromkowski Attorney at Law The Jefferson Bldg. -- Suite 103 105 W. Chesapeake Ave. Towson, MD 21204 Tel. 410 821-6116 Fax. 410 828-0705 also Kromkowski@aol.com =====================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Sat, 22 Jun 1996 12:29:18 -0400 (EDT)
[Topic List] [Next by author] [First of thread] [First by author]> From den.list-request@deming.ces.clemson.edu Wed Jun 19 18:54:56 1996 > Return-Path:[Topic List] [Next by author] [First of thread] [First by author]> Received: from eng.clemson.edu by deming.eng.clemson.edu.eng (4.1/SMI-4.1) > id AA12723; Wed, 19 Jun 96 18:54:55 EDT > Received: from deming.eng.clemson.edu.eng by eng.clemson.edu (SMI-8.6/SMI-4.1) > id SAA23123; Wed, 19 Jun 1996 18:54:24 -0400 > Received: by deming.eng.clemson.edu.eng (4.1/SMI-4.1) > id AA12718; Wed, 19 Jun 96 18:54:54 EDT > X-Envelope-From: jkaliste@skipjack.bluecrab.org Wed Jun 19 18:54:51 1996 > Received: from eng.clemson.edu by deming.eng.clemson.edu.eng (4.1/SMI-4.1) > id AA12712; Wed, 19 Jun 96 18:54:51 EDT > From: jkaliste@skipjack.bluecrab.org > Received: from deming.eng.clemson.edu.eng by eng.clemson.edu SMI-8.6/SMI-4.1) > id SAA23120; Wed, 19 Jun 1996 18:54:21 -0400 > Received: from skipjack.bluecrab.org by deming.eng.clemson.edu.eng 4.1/SMI-4.1) > id AA12709; Wed, 19 Jun 96 18:54:49 EDT > Received: from cfn_client33.bluecrab.org (cfn_client33.bluecrab.org [206.205.140.83]) by skipjack.bluecrab.org (8.7.4/8.7.3) with SMTP id AA10918 for ; Wed, 19 Jun 1996 18:54:14 -0400 (EDT) > Date: Wed, 19 Jun 1996 18:54:14 -0400 (EDT) > Message-Id: <199606192254.SAA10918@skipjack.bluecrab.org> > X-Sender: jkaliste@skipjack.bluecrab.org > X-Mailer: Windows Eudora Version 1.4.4 > Mime-Version: 1.0 > Content-Type: text/plain; charset="us-ascii" > To: den.list@deming.ces.clemson.edu > Subject: Re: Psychology -vs- Physiology > >On Saturday, June 15, John Kaliste (?) wrote: > > It is great to have Dr. Tolman aboard. I am no phd, but I feel > that the psychological does not exist, only the psychophysiological. People > observe what they are trained to understand, and focus on how they have been > trained to help. > >John, I would like to ask for more definition of what you mean by the >"psychological does not exist, only the psychophysiological"? For >the hard-core psychoanalysts, psychology, meaning the internal >perception of events and internally generated reaction to events, is >all that matters. Nothing exists outside of the human mind. My sensibilities do not convey externally. My eyes see only a fraction of what my brain translates into my perception of what I think I see. Pyschophsyiology. I am no analyst. I believe it was Gardner Murhpy who described how the mind throws + noise + into the + channel+ , tightening of muscles, drumming fingers on the table. Watch Bill Clinton on t.v.,it is easy to see when he is telling a An analyst uses a couch to get people to relax, so they can attempt to get past this defense. >Our ability to understand new concepts and new ideas is constrained >by the language we use to describe those concepts and the rigidity of >our own cognitive system. Deming's point that the system cannot know >itself reminds me of this point. My belief is that there is no >essential distinction between "psychology" and "physiology". Thank you >The current dominance of biochemical explanations for behavior is nothing more >than a reductionistic explanation .... Some one I love very deeply is bi polar. This is caused by a chemical inbalance in the brain. I have seen this person have all of the properties of being asleep. They will physically spasm, and become awake. After many endless days days, they will become manic, attempt geographical cures, and become suicidal, from lack of sleep. Medication relieves this. The physical lack of sleep causes a mental>> stress. >Would you say anabolic steriod intake, combined with intense >exercise, > would not affect behavior? > >I will probably add more on this later. These were just some >prattlings at the end of the day. I hope they are helpful. You are not prattling. We need you, your knowledge,and skills. Thanks, John jkaliste@skipjack.bluecrab.org ==============================================================
Sat, 22 Jun 1996 12:05:12 -0700
[Next of thread] [Next by author] [First of thread] [First by author]David Kerridge asked: >1) Is an aggreesive response a sign that we are making progress, or > an obstacle to progress? An "aggressive" response from someone who could influence progress suggests: the individual is not open to alternative thinking at the moment, will resist collaborative efforts, and would probably be an obstacle to progress. > >2) If it is an obstacle, how can we present the new ideas effectively > without causing an aggressive response? There are so many different reasons and combinations that underpin an individual's resistance to change that one would have to know much more about the history and context of the individual to suggest a presentation strategy that might not cause an aggressive response. Unless the person is a "show-stopper" and warrants the effort, I will generally focus my time and energy on those who can, at the very least, enter into dialogue. ***************************************************************************** "I never said it would be easy, I just said it would work." W. Edwards Deming ***************************************************************************** George A. Thomas Mananagement Consulting & Training (916) 684-4381 gathomas@mail2.quiknet.com ***************************************************************************** ===========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Sat, 22 Jun 96 21:55:35 BST
[Topic List] [Next by author] [First of thread] [First by author]John D Kromkowski asks an interesting question: >I was wondering if any one could comment on the inability of the p-, np-, u-, >and c- charts to provide information on the "flatness" of a system's >variation. The spread of variation in these charts is always a function of >sample size, if I understand correctly...... Yes, that's right. The control limits in these charts are calculated from the theoretical model, which does sound risky, since no one should ever believe that a theoretical model is "true". But we don't need to. The control limits are meant to show the best that the system could do, in an ideal state. We know we are never in the ideal state, but we want to know if we are getting close to it. So the theoretical model which describes that unattainable ideal is a good standard to check the real variation against. >................................It seems to me that there may be >quite a bit of difference between a system that produces defects in a narrow >band and a system that produces defects in a larger (although within the limits >predicted by p-, et al charts) band. Since the theoretical model shows the best you can possibly get, if we get narrower limits for variation than that, something is very fishy. Usually it means that someone is cheating: for example not recording defects if there are too many of them. As Dr Deming comments in one of the MIT Deming Library tapes (which everyone should see), this happens much more often than people think. Equally we find, quite often that the spread is much wider than the theoretical model tells us to expect. This occurs is defects are not independent, and occur in clusters.. > >Unlike x-Bar and X/moving R, these charts (p-, et al) do not seem to imbed >within the calculation of limits information about how one data point varies >from the next. I'm not sure about this, but it seems that the underlying >assumption of the p-, et al charts is that individual data points are >_independent_ of the prior and the next (like the hypothetical fair coin >toss). How does this rub against the idea of SYSTEM. As I said above, we don't really believe this: but as we improve the system we get nearer and nearer to it. I usually draw both charts for investigation purposes, that is the chart which treats the points as individual values, and the appropriate other chart. Usually they tell the same story. If they don't, you may find extra information about the process. For routine purposes, as opposed to initial investigation, one is enough. > >In the context of the red beads and using the data from TNE example, won't >an Ind. X/ moving R chart provide essentially the same results? Yes, because in those cases the models fit well. But drawing both helps you to find if this is true. David Kerridge dfk@abdn.ac.uk ======================================================================[Topic List] [Next by author] [First of thread] [First by author]
Sun, 23 Jun 96 18:50:57 BST
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Thanks to all who have contributed, both on the net and privately.
As several have said, there are several different situations, which
should be regarded separately.
1 We may be giving a presentation to a group who are completely new
to the ideas. Then the order in which we present them is important.
2 If we are trying to introduce the ideas within a company, the
important of "Drive out fear" is very great. No one can be expected
to react well to ideas that create fear if there is fear already
in the organisational structure.
3 We may be explaining Deming ideas to those who already have some
knowledge, either of the Deming Philosophy or of some other system.
This is the situation which gives me most difficulty, because it
involves unlearning - ten times more difficult than learning from
a "clean slate".
Dr Deming seemed to imply that you only have one chance with education.
I hope he did not mean that those who have been wrongly taught should be
written off: it does not sound like him. This was the main reason I raised
the topic.
Clearly it is far better to avoid the problem, by making sure that all
introductory teaching is of the highest quality. But we face the situation
in which harm has been done.
Does anyone have advice on helping people to unlearn? I do not know of
any research on this, apart from that mentioned by Howard Gardner in
"The Unschooled Mind". But there must be a good deal of research and
experience out there somewhere.
I also have some comments and questions on fear and reactions to fear,
but will save these for another posting.
David Kerridge
dfk@abdn.ac.uk
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Sun, 23 Jun 1996 10:46:03 -0400 (EDT)
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>I was wondering if any one could comment on the inability of the p-, np-, u-,
>and c- charts to provided information on the "flattness" of a system's
>variation. The spread of variation in these charts is a always a function of
>sample size, if I understand correctly. It seems to me that there may be
>quite a bit of difference between a system that produces defects in a narrow
>band and a system that produces defects in a larger (although with the limits
>predicted by p-, et al charts) band.
>
>Unlike x-Bar and X/moving R, these charts (p-, et al) do not seem to imbed
>within the calculation of limits information about how one data point varies
>from the next. I'm not sure about this, but it seems that the underlying
>assumption of the p-, et al charts is that individual data points are
>_independent_ of the prior and the next (like the hypothetical fair coin
>toss). How does this rub against the idea of SYSTEM.
The pattern displayed by the relationship of the individual points
is what it is all about. If you have an upper and lower limit, you will have
a center. The distance from center is what we are measuring. If you see
a saw tooth pattern, slowly rising or falling and then abruptly and perfectly
corrected many times, you may have tampering. If you have that much control,
you should be able to have a centered line, or almost a lack of pattern. If
you are lacking variation, it is time to tighten your limits.
Look for a pattern, five points in a row on one side of center, or
too little variation, to see if something is wrong, or right.
This is an indication only. System knowledge is understanding the
cause of the effect.
Thanks,
John
jkaliste@skipjack.bluecrab.org
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Sun, 23 Jun 1996 09:52:23
[Topic List] [Next by author] [First of thread] [First by author], I would suggest that Subject Lines follow the following format: > >SYSTEM - unique desc. >VARIATION -unique desc. >PSYCHOLOGY - unique desc. >THEORY OF KNOWLEDGE - unique desc. >ANNOUNCEMENTS -unique desc. >OTHER - unique desc. > Main problems then is that we would be breaking into parts that which we should be learning to synthesise into a whole... Julie Beedon VISTA Consulting - for a better future julie@vistabee.win-uk.net ======================================================================[Topic List] [Next by author] [First of thread] [First by author]
23 Jun 96 17:45:10 EDT
[Next of thread] [Next by author] [First of thread] [First by author]In response to David Kerridge's question: I doubt whether we are going to find a useful theory. We probably have to CONSTRUCT it. Maybe it's helpful to view the problem from a human motivation viewpoint. The victim (person with alcohol problem, drug-dependency, or commitment to management style that 'frustrates' basic human needs) is motivated to change. He sees the benefits of change. But he sees them unclearly. The benefits are distant and there is a risk they will prove illusory (at its simplest, the 'patient' may die before the cure is complete!). The costs are more obvious and painful -- short-term disruption to the existing steady-state pattern of behaviour. The status quo may not be 'good' but it has become 'comfortable'. Human motivation is describable by a number of theories (Herzberg, Laborit, Lawler, Maslow, Girard, etc) each of which deals quite well with human motivation in some circumstances. But none of these theories is complete. Each accounts for only part of the picture. In principle these partial theories can be integrated into a more complete theory of human motivation -- we would need to take account of interactions in the larger 'system'. The system here does not really have to encompass the complete range of human behaviour. Managers and consultants (who are the real problem for the Deming community) are DIFFERENT from the average man-in-the-street. It's really just this subgroup of humanity whose behaviour and motivation we would like to understand better -- so we can find how to influence it for the better. Viewed this way, the problem would become simpler. That's important because the problem is, I think, tough enough that we should take every opportunity to abstract and simplify. In fact, of course, there is diversity among managers. They do not all behave the same. But I think that MOST managers do fall into a narrow enough range of behaviour and motivation patterns that a useful theory could be developed by focusing attention on some sort of an 'average manager' and ignoring 'outliers'. Our theory would not attempt to describe perfectly the motivation of EVERY manager or consultant. We do not need to succeed with every one. It would be nice just to succeed a lot more than we do now! I have already seen a 'theory' of the type I am describing. This is in the form of a model of human motivation, and has been developed to help managers in large organisations deal more effectively with motivational issues. It is being used by the French Army to help junior officers cope better with the reactions of the soldiers under their command (who are often more mature and far more experienced than the officers). Modern armies are struggling to adapt to the need to allow soldiers to think and not just obey orders -- often a big break from traditional military management. It is also being used by industrial organisations to help managers to understand the motivational factors affecting real sales people. The point about this approach is that it is not anecdotal or based on memories of a few 'case studies'. It attempt to be rigorous and to build on the work of serious psychologists. It makes predictions and is testable. And it can be used to influence the behaviour of people. Ian Griffiths email: 100326.1264@compuserve.com tel: (44) 01383 872937 ==========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
23 Jun 96 17:07:05 EDT
[Next of thread] [Next by author] [First of thread] [First by author]Patrick Owings post was encouraging. It reminded me that many things need to be taken into account, beyond leadership. For a successful project, certain other things need to be in place. If you do not have this Then you will get this Leadership No action A clear aim No sense of direction A compelling philosophy No followers A useful vision Confusion. Where are we headed Strategy for action False starts Skills Anxiety Resources Frustration Rewards Bitterness Organization and Communication No coordination Myron Tribus ===========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Sun, 23 Jun 1996 18:22:20 GMT
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At 16:00 6/21/96 +0000, you wrote:
>I was wondering if any one could comment on the inability of the p-, np-, u-,
>and c- charts to provided information on the "flattness" of a system's
>variation.
>
>In the context of the red beads and using the data from TNE example, won't
>an Ind. X/ moving R chart provide essentially the same results?
>
John:
The purpose of a control chart is to determine if special causes exist or
not. A control chart is an operational definition of a special cause.
Remember that Shewhart in designing control charts balanced two mistakes. He
developed the control limits empirically to balance the two mistakes.
Shewhart used a model of the normal distribution. Contrary to some texts, he
did not assume an underlying normal distribution. Nor did he rely on the
Central Limit Theorem. With samples of four that he used, a condition of the
Central Limit Theorem is not fulfilled. Further, the Central Limit Theorem
does not hold for all underlying distributions. Shewhart simply said that an
assignable cause is one where points fall on or outside the three sigma
control limits. Today we use the term special cause rather than assignable
cause.
When we deal with attributes, we use approximations to the normal
distribution in constructing p-, np-, c-, and u-charts. Shewhart's
operational definition of the special cause still holds for these charts.
However, we must be very, very careful that we do not mix apples, oranges,
bananas, and other fruit when we get our data to estimate the
non-conformance. If we have mixtures, we introduce the variation between
items. The total variation is the variation within samples plus the
variation between samples if the correlation coefficient is zero. If it is
not, we have to adjust the total variation by the covariance.
Each point on the control chart has an within sample variation. Using these
points in a moving range chart we obtain an estimate of the variation
between points. Since Shewhart's analysis is based on variation within
observations, the use of a moving range chart gives us a different
variation, which by coincidence may be the same. However, it no longer
matches Shewhart's original operational definition of an assignable cause.
You suggested to use the example in The New Economics. I did this for both
the Nashville and the Newport Beach data. The control limits were as follows:
X, MR chart np-chart
City LCL UCL LCL UCL
Nashville 3.30 15.79 0.73 18.36
Newport Beach 0.69 19.44 0.63 18.12
In one case the chart for individuals has a narrower range than the np-chart
while in the other case the opposite is true.
If one adds one more reading of 18 for Nashville and 19 for Newport Beach we
get an interesting result. This change causes Nashville data to indicate a
special cause for the chart for individuals, but not for the np-chart. On
the other hand, the Newport Beach data shows the chart for individuals to
consist only of common causes while the np-chart shows a special cause to be
present.
Using the inappropriate chart can give misleading results. In some cases one
fails to act while in others, tampering can occur.
My suggestion is that rather than try modifying the methodology of analysis,
we look at the data to be sure that it is homogeneous. The very interesting
situation described in your message is common and most often is due to a
problem in data definition.
Bill
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Sun, 23 Jun 1996 16:48:09 -0400
[Next of thread] [Author List] [First of thread] [First by author]I attempted to send a message a few weeks back and let's just say that it was a "lesson learned". I have been reading randomly for the past six weeks, or so. I'll give a little background on myself before I get into my topic. I am a product designer (structures) with General Motors Midsize Car Division. I am currently assigned to an assembly plant in the Atlanta area (6-8 months). I attended my first 4 day Deming seminar sponsored by GM Powertrain in March of this year and it had some rather strong effects on my thought process. I hope to continue expanding my understanding of Dr. Deming's work. With the help of a network such as this, along with friends I have made thru the seminar, I believe it will be fulfilling. I also plan on attending some future seminars, though I don't think I'll make the one in October. Because I am a fairly new student of Deming, many of my posts are likely to be questions (as I sift thru all that there is). I have been pondering a question for some time and would be interested in hearing the thoughts of others. The subject is pride of workmanship. Joy in work, enthusiasm, pride, etc. etc. Is there much of a difference between these or do they parallel? If my work environment enables me to have pride in my work, does it also lead to enthusiasm? Do we have an idea (based on any known studies), what percentage of productivity can be unleashed if management is successful in creating an environment conducive to pride and enthusiasm? How can such a thing be measured......or is this not possible? Diane M. Korzeniewski GM MCD Engineering Design collabr8@mindspring.com ToCOLLABR8@aol.com ===========================================================================[Next of thread] [Author List] [First of thread] [First by author]
Mon, 24 Jun 1996 10:33:44 +1000
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I found that Dr. Wheeler's recent book "Advanced Topics in Statistical
Process Control" from SPC Press makes several interesting points in
discussing attribute charts.
In particular he concludes that as the attribute charts are based theorectical
probability model which makes extra assumptions (beyond Statistical
Control) it is better to use Individual X and moving R charts if you have
any doubts about these assumptions.
As he puts it, the X & R charts limits are based on the distribution
of the data (empirical limits) and hence much more robust than the
attribute charts which assume indepedance and constant probability
per unit area et cetera. With attribute chart's he says you must check to
see if the theory is appropriate.
Dr. Wheeler also compares limits obtained with the two different methods
and even suggests that the X & R chart may pick up special causes
missed because of it's robustness in his example. From memory one
point he concides is that attribute charts are considerably more
efficient in the use of data than X & R. That means to get the same
degree of certainty about the value of the control limits takes
significantly more data with X & R charts. But this becomes
irrelevant if collect more data.
He does mention though that the X & R charts doesn't show up as
clearly the kind of tampering with data Deming mentions in "Out of
the Crisis" in which the peaks are smoothed out. Which might be
important if it is common as David Kerridge suggests.
I can post more details from the book such as the exact assumptions which
the different charts assume of the data and perhaps some examples if
people are interested. Otherwise I suggest reading the book.
Frankly I find the whole subject of SPC fascinating. I would be interested
to here of any examples of whole one can apply it to everyday life.
e.g. I have tried to plot petrol consumption as kilometer / litre but found
that longish trips happen sufficiently frequently to disturb almost every
2nd or 3rd point. If I used more petrol this might become less of a problem
as one point corresponds to two weeks!
Andrew Worsley
Australian Artificial Intelligence Institute Email: amw@aaii.oz.au
6th floor, 171 Latrobe St. Phone: +61 3 9663 7922
Melbourne, Victoria, 3000, Australia Fax: +61 3 9663 7937
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Sun, 23 Jun 1996 20:41:49 -0400
[Topic List] [Next by author] [First of thread] [First by author]David, thanks for the help and work you did with the information on the various charts. To those of us who are not true math majors these discussions really help thanks again Bill Cooper bcoop1116@aol.com ============================================================================[Topic List] [Next by author] [First of thread] [First by author]
Sun, 23 Jun 1996 20:42:07 -0400
[Topic List] [Next by author] [First of thread] [First by author]Bill, thanks for the very coherent explanation that you gave us on Dr. Shewhart and the control chart. Dr. Deming would be proud of these types of discussions on this net which indeed are helping all to continue to learn and grow. I intend to extract some of this material Bill and use it on a client who keeps wanting to argue the Shewart works. (hope you don't mind) I remember some one asking Dr. Deming why he believed and used Dr. Shewhart's work so much and he said "because it works". Maybe that might be good enough for some of us as a reason. Thanks again for the work. Look forward to seeing you in October. Bill Cooper bcoop1116@aol.com ===========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Sun, 23 Jun 1996 20:42:14 -0400
[Next of thread] [Next by author] [First of thread] [First by author]Myron, talks about the "inaction of leadership". It is the biggest problem that we all face in this issue of change strategies or Deming theories. Why is it that the very leadership that we must have, and all seek, has become almost a non existent capability of our current leaders. I would like to see us enter into a discussion of how to get the leadership of and organization to move forward on any issue that involves change and risk. I am sorry that we all as a group did not get Dr. Deming to spend more time in his writings on this subject of leadership. He addresses it briefly, in various writings, but never in his four day seminars did he really focus on how we might help these leaders move forward on implementing a customer focused quality program. Maybe we in this net can use our collective wisdom and provide to our members what Dr. Deming said about leadership in various forums and see if we can help some of the people who are dealing with the various frustrations. Bill Booper bcoop1116@aol.com =========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Mon, 24 Jun 1996 10:47:17 -0400
[Next of thread] [Next by author] [First of thread] [First by author]At 10:33 AM 6/24/96 +1000, Andrew Worsley wrote: > Frankly I find the whole subject of SPC fascinating. I would be interested > to here of any examples of whole one can apply it to everyday life. > e.g. I have tried to plot petrol consumption as kilometer / litre but found > that longish trips happen sufficiently frequently to disturb almost every > 2nd or 3rd point. If I used more petrol this might become less of a problem > as one point corresponds to two weeks! > Perhaps the difficulty you're encountering has to do with how you're measuring fuel consumption - every two weeks, whether you have driven the car or not. I've been tracking the fuel consumption of my cars for years, but with respect to distance driven, rather than time. Hence, the abscissa is the distance, and the ordinate is the amount of fuel. I find it easiest to reset the trip meter every time I fill up the car. The slight variation in the amount of fuel per fill-up is too slight to make a significant difference. I have, however, noticed a very pronounced non-random seasonal variation in my cars' fuel consumption (my current car is much more affected by it than my previous cars). In the winter, the consumption goes up by almost 20%, and the change is quite rapid. It's almost as if there is a step around 0 deg. C. This may not be an issue in Melbourne, but it raises an interesting problem. All current literature on SPC (that I've seen) suggests that one's goal is a stable process where the data are randomly scattered about some average, which is a horizontal straight line. What do we do when we know that the line is neither straight, nor horizontal? If we lump the non-random variation together with the random variation, we'll obviously have meaningless results that will tell us that the process is not in control. But I haven't seen any SPC models that take non-random variation into account. Another example of non-random variation is the gradual degradation of the process - I suppose that's where the 'run up' and 'run down' trends come in - but must one sit and wait until the degradation shows up on the chart when one knows that the output begins to deteriorate exactly N hours after the last clean-up? I'd be interested in learning if anyone has been using SPC for processes with non-random variation, and how they've gone about it. Alla Linetsky ========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Mon, 24 Jun 1996 15:02:19 -0400
[Next of thread] [Next by author] [First of thread] [First by author]Bill Your points are well taken and I hope already generally intergrated into my thoughts. What I had hoped to stimulate by the request for comment was not necessarily a change in method (from p- et al to X, et al), but a deeper understanding of the tools for understanding variation. Sometimes the use of tools can be mindless and not lead to understanding but understanding balance and riding a bike are also two different things. Put another way: show me goods works and I will show you the faith that undergirds them. There are a lot of hacks talking about variation without using the tools. You point that >>Shewhart used a model of the normal distribution. Contrary to some texts, he did not assume an underlying normal distribution<< is important. However, isn't this is only for the the X-bar and Ind. X charts? You suggest that >>When we deal with attributes, we use approximations to the normal distribution in constructing p-, np-, c-, and u-charts<< But this is really not the case, is it? Unlike the X- charts, the p- et al charts are not _approximating_ anything. The p- et al charts, on the other hand _require_ and underlying assumption of the poisson distibution. (may need some help here, I usually have to look this stuff up). The poission distribution is the heads/tails (or yes/no) of the mythical fair coin (a special type of normal distribution, right?). And as part of this assumption isn't there the further assumption of the independence of each event? The X-bar and Ind. X charts on the other hand recognize a kind of "system memory" where outcomes are connected to one another. I want to draw an analogy to brownian motion but I fear I am in over my head here for a lunch time post. These charts are, as I have argued before, making an "appoximation" of a normal distribution. You continue: >>If one adds one more reading of 18 for Nashville and 19 for Newport Beach we get an interesting result. This change causes Nashville data to indicate a special cause for the chart for individuals, but not for the np-chart. On the other hand, the Newport Beach data shows the chart for individuals to consist only of common causes while the np-chart shows a special cause to be present.<< Think about this for a moment: "if one adds one more reading". You mean, with in the context of the experiment, "if the next willing worker happens to draw on the next turn . . .." The Red Bead experiment is not hypothetical. I put the data together when I calculated an Ind. X chart (I like to have at least 28 points, why? who knows?) and I don't have it right with me here, but how does "adding" the data proint you propose (cheating) change the limits? How, if at all, would doing the Red Bead experiment with a paddle with only 10 depressions or a million marbles, change what chart one uses? What if we don't put the balls back into the bin and mix? John D. Kromkowski also Kromkowski@aol.com ==========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Mon, 24 Jun 1996 18:53:40 -0500 (EST)
[Next of thread] [Next by author] [First of thread] [First by author]At the time I received Diane Korzeniewski's posting about the difference between pride in work and joy in work, I had just finished reading my graduate MBA class reflection papers. I gave them the following statement which Tom Johnson develops so brilliantly in his book "Relevance Regained"-------Accounting based targets should not be used to control people or processes-----and asked them to take a position and defend it. Twenty out of twenty-one students agreed with Johnson's premise. The class is also reading the Deming Dimension by Neave so they are also familiar with Dr. Demings views on the dangers of arbitrary numerical goals. What was most interesting were the personal stories and examples from their work experiences about the dangers and dysfunctional consequences from using accounting based targets to control people and processes. The examples included distortion of figures, distortion of the system, internal competition which resulted in sub-optimization of the overall system, fear, and barriers to improvement. I am convinced that pride and joy in work are not possible in a culture that manages by accounting targets and holds employees accountable for these numerical goals. My graduate students during the past four years have convinced me that most organizations are clueless when it comes to recognizing the dangers from such a management philosophy. Such a culture fails to nourish the "soul" of the organization and their employees. How can anyone have pride in work and joy in work in such an organization? Every quarter my students tell stories of how numbers and processes are distorted in order to "make the numbers". Putting your employees in such positions not only does tremendous damage to their souls, but also destroys any chance of pride and joy in work. Deming once said there maybe and excuse for ignorance but there is also a penalty for it. The penalty for using accounting based targets to control people and processes is the destruction of any pride and joy in work. Joe Castellano JCastellano@desire.wright.edu ======================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Mon, 24 Jun 1996 13:05:59 -0700 (MST)
[Next of thread] [Next by author] [First of thread] [First by author]I have been enjoying the discussion on how to deal with aggressive responses to teaching Deming principles, especially the wonderful posts by Robert Crow. I would suggest two ways of understanding how an aggressive response might occur. This might help us understand how to approach persons with such a response. First, along the lines that I have posted before, people tend to think irrationally. This means that they develop their own theories of what is "supposed" to be, what "should" be, and how life "ought" to be run or how a company ought to be run. These theories or explanations or models for themselves tend to be irrational because they are not based so much on "reality" or data, but are based instead upon training, history, learning, and models by powerful others. For example, if I learned from a powerful administrator that things "should" be such and such, then as I develop in my own career, I tend to believe that that is the way things ought to be. Why? Because I want to ultimately become powerful like he/she was and that is what they believed. I don't want this to seem like a logical conclusion reached through a careful thought process, because most of the time it is not. Anyway, then you come along and tell me, "No, performance appraisals belong on the dungheap." Well, that flies in the face of what I thought was self-evident, what I thought was the way things should be -- and so I react emotionally. Clinically, I borrow from the Bible and say that we often "kick against the pricks" meaning that we beat ourselves against the way the world really is. I think most people, after being presented with a forceful, logical, Deming-based argument or demonstration such as the funnel or red-bead experiment, begin to see the light -- begin to see how this different way of viewing reality fits better than the old one. However, we have to first overcome the irrational shoulds in order to make our point. Second, cognitive dissonance theory fits well here and is really just a spin on what I said above. Many experiments have indicated that when people can find an external reason for their behavior, they are much more willing to discount its value. For example, if I pinched my sister because a friend told me they'd give me a dollar, then that is the reason I did it. I don't particular like pinching my sister, I am not a mean person, I did it for the money. If I pinched my sister with no external reason, I experience an unpleasant state called in psychology, dissonance. This means that I cannot reconcile my behavior with the type of person I think I am. I can resolve this by decided that I _am_ mean, and acting that way, or by apologizing and becoming friends with my sister, but I am motivated to eliminate the dissonance. For people who have adopted or "bought" the old way of thinking that Deming rails against, to consider these new thoughts may create dissonance. Think of the supervisor who for years has graded people and watched how it affected them, but who thought this was the way it "should" be or who was trained to believe this. One way to resolve the dissonance is to more firmly entrench myself in my position, to prove to you that you are full of it, and failing that, to become aggressive enough to get you to back off and take your ideas away. The other way, of course, is to embrace it, examine it, and use the new ideas. These understandings help us look at different ways to approach people who are resistant. For example, can we offer them an external reason for the existence of the previous system? Sure, it made sense then, we all believed it, it was the zeitgeist of the time, etc., but there is a new opportunity now to see it in a new way. We can also attack irrational thinking by the use of experiments such as the red- bead (or Green M&M) ones or by helping them explore ways not to "should" on themselves or others. One way to do this is to point out the famous bumper sticker -- "Sh*t Happens" and explore why do we all react to this. If should were true, would this sticker be true? There are lots of other ways to perhaps impact people's reactions to our message. Let's continue to explore them. Anton O. Tolman, Ph.D. Director, Psychological Services Director, Program Services Wyoming State Hospital P.O. Box 177 Evanston, WY 82931-0177 Anton@wsh.state.wy.us (307) 789-3464 ====================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Tue, 25 Jun 1996 10:34:52 +1000
[Next of thread] [Next by author] [First of thread] [First by author]> At 10:33 AM 6/24/96 +1000, Andrew Worsley wrote: > > > Frankly I find the whole subject of SPC fascinating. I would be interested > > to here of any examples of whole one can apply it to everyday life. > > e.g. I have tried to plot petrol consumption as kilometer / litre but found > > that longish trips happen sufficiently frequently to disturb almost every > > 2nd or 3rd point. If I used more petrol this might become less of a problem > > as one point corresponds to two weeks! > > > > Perhaps the difficulty you're encountering has to do with how you're > measuring fuel consumption - every two weeks, whether you have driven the > car or not. I've been tracking the fuel consumption of my cars for years, > but with respect to distance driven, rather than time. Hence, the abscissa > is the distance, and the ordinate is the amount of fuel. I find it easiest > to reset the trip meter every time I fill up the car. The slight variation > in the amount of fuel per fill-up is too slight to make a significant > difference. Actually I am measuring consumption per distance travelled, obviously I didn't explain that clearly. It's just that we make mostly small trips so that we only fill up once every two weeks. If we drove more we fill up more often and get more data points. Once in a while we go on a long trip and the "mileage" improves up to around 10k/l (from 5-6) which is an clearly an out of control point. But this happens so often that I am excluding over half my data points! Another source of data is measuring your weight. But you need scales that are particularly accurate, at least .2kg (.5lb?) to detect the minor fluctuations and even then you need to subgroup them in (say 4-7 pts) to get enough variation to avoid insufficient sensitivity problems that Dr. Wheeler talks about. > > I have, however, noticed a very pronounced non-random seasonal variation in > my cars' fuel consumption (my current car is much more affected by it than > my previous cars). In the winter, the consumption goes up by almost 20%, and > the change is quite rapid. It's almost as if there is a step around 0 deg. >C. This may not be an issue in Melbourne, but it raises an interesting problem. I believe the efficiency of a car engine does vary a lot with tempreture and hence it is standard practice to adjust the air intake for summer or winter, even in Melbourne. > > All current literature on SPC (that I've seen) suggests that one's goal is a > stable process where the data are randomly scattered about some average, > which is a horizontal straight line. What do we do when we know that the > line is neither straight, nor horizontal? If we lump the non-random > variation together with the random variation, we'll obviously have > meaningless results that will tell us that the process is not in control. > But I haven't seen any SPC models that take non-random variation into account. I have seen this sort of situation in timing data for running or swimming laps. It can also vary over time. I don't know the cause as the data was collected well before being plotted. Dr. Wheeler suggests that you need to plot the data as close as possible to where it's collected - so as soon as you see a OOC (Out Of Control) point you can look around for special causes, perhaps note the conditions on the graph. If the cause is understood perhaps you can control it - or (such as for the weather) alter the process to suit the change? If not perhaps you can subtract it out. > > Another example of non-random variation is the gradual degradation of the > process - I suppose that's where the 'run up' and 'run down' trends comein > - but must one sit and wait until the degradation shows up on the chart when > one knows that the output begins to deteriorate exactly N hours after the > last clean-up? According to the example of the cigar lighter (from one of Dr. Wheeler's books) degradation from wear does show up rather suddenly. I presume that it's affect is minor until a certain level is reached and then suddenly it dominates the other (common) causes of variation. i.e. until generates OOC points you don't need to worry about it, as it's affect is below that of other common causes. > > I'd be interested in learning if anyone has been using SPC for processes > with non-random variation, and how they've gone about it. Non-random variation is probably a good definition of OOC variation. I think that with such variation, if you can't control it or subtract it out you are limited in what you can do. Another interesting situation is when the data is highly auto-correlated. (i.e. successive points are correlated) This often occurs when measuring some changing attribute (tempreture/pressure). It's value is not completely random as it's next value depends on it's current value, although after enough time, it's actual value is random. The weather seems to be a good example [I was told 75% of the time the weather tomorrow will be like today]. In this case Dr. Wheeler suggests if it's correlated above .8, you can expand the control limits by a factor which he gives to allow for this. But I guess you lose sensitivity. I see similar auto-correlation cycles in the lap time running data. I am not sure if this is fitness comming and going or a physiological cycle of the body of the order of a month. Any doctors of medicine out there? I too would like to know how other people handle these situations. Does it represent the limits of what we can do? e.g. If you can't eliminate these sorts of variations or calculate them out, does that mean you can't reduce variation much more? Thanks Andrew Worsley ==============================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Tue, 25 Jun 1996 8:43:19 -0700 (PDT)
[Topic List] [Next by author] [First of thread] [First by author]:> :> All current literature on SPC (that I've seen) suggests that one's goal is a :> stable process where the data are randomly scattered about some average, :> which is a horizontal straight line. What do we do when we know that the :> line is neither straight, nor horizontal? If we lump the non-random :> variation together with the random variation, we'll obviously have :> meaningless results that will tell us that the process is not in control. :> But I haven't seen any SPC models that take non-random variation into account. :> [snip] :> :> I'd be interested in learning if anyone has been using SPC for processes :> with non-random variation, and how they've gone about it. :> :> Alla Linetsky :> :> ======================================================================== :> :> I agree with Andrew that the subject of SPC is fascinating. Alla, we have addressed the non-random variation for some our clients by using some statistical methods to take the non-randomness out of the data. On the "run down"/"run up" data, we run a regression analysis on the data, then plot the residuals to the Control Chart. The gasoline consumption problem might be addressed by running a time series analysis on the data, and plotting the residuals on a Control Chart. The trick is, of course, finding the best model for each of these. Both these methods create a horizontal plot of the data. But we have also done some work with using control limits from these calculations to calculate the control limits on the original data. Then we run a Control Chart on the original data with the control limits set as calculated. This can lead to possibly having 4 charts instead of the traditional 2: A de-trended chart and recalculated limits chart for both a location chart and a dispersion chart. Another chart we have been working with is suggested by your comment about: "output begins to deteriorate exactly N hours after last cleanup". This is what we call a Step Chart or Phase Chart. The process goes thru a number of phases that would have separate control limits. For example: History, Trial, Implementation. This chart calculates the control limits for each phase and plots the data on the same chart. Some real interesting stuff. Oops, I don't think I've introduced myself to this list. I'm Guy March, Training Coordinator for Statware. We produce Statit, a Data Analysis tool that, among other things, does SPC charts. Runs on Unix, Win95 and NT. I am involved in Customer Training and Support and have been in that field for many years. I have a technical educational background, Nuclear Engineering and Numerical Analysis. With my schedule, I have mostly lurked on this list, but as you say, Andrew, SPC is fascinating and I just had to comment on this idea. Guy W. March guym@statware.com ===========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Tue, 25 Jun 1996 08:54:00 -0700
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I'm looking for DEN advice and direction on what Masters Programs are
available related to The System of Profound Knowledge.
Here's my situation. I have a B.S. in Mechanical Engineering 12/90. 5+
years experience in engineering, project management and leading Total
Quality (Training & Facilitation) in the Aerospace industry (NASA &
AlliedSignal). I also have been leading the Greater Houston Deming
Alliance for about four years. All my education has come from 5 years
of self-study and practice on the front lines. In a world of
credentials, this has been a hard sell in landing a job managing
organization-wide Continuous Improvement. Internal opportunities are
non-existent because we are downsizing. I'm frustrated and have decided
I need more "official" education or "Pigskin" to accomplish my aim.
Communicating Deming's Ideas in an 20 minute interview with a
traditional HR type just doesn't work. ISO9000 is their bottom line.
My questions are many and open to any new ideas you may have. Are there
any good distance learning programs? Are there any MBA or other
interdisciplinary programs that I can take courses in
philosophy/epistemology, psychology, variation, and systems theory? What
alternatives to an traditional MBA do I have? How do I find gold in
such a wide array of programs? What is good way to do research? I want
to explore and create new ideas with the System of Profound Knowledge
and at the same time get a marketable degree. (I'm even considering
Religion studies.) Am I asking the right questions?
As you can see, I'm struggling.
ANY suggestions you might have would be greatly appreciated.
Thanks!
Have a Great Adventure!
Don Kerr
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Wed, 26 Jun 1996 10:52:29 -0500
[Topic List] [Next by author] [First of thread] [First by author]Joe Castellano talks about a culture that is based on numerical accounting goals and holds individuals responsible and says: >Such a culture fails to nourish the "soul" of the organization and their >employees. How can anyone have pride in work and joy in work in such an >organization? Every quarter my students tell stories of how numbers and >processes are distorted in order to "make the numbers". Putting your >employees in such positions not only does tremendous damage to their >souls, but also destroys any chance of pride and joy in work. I'd like to suggest that the organization and the people who make up the organization are the same thing. By dehumanizing the organization, you ignore this fact of life, and there is indeed a penalty. This penalty came be summed up in one word: mediocrity. On the other hand, we should appreciate that no one would knowingly take actions that result in mediocrity. So the problem is one of lack of knowledge and understanding of the principles on which quality management practices are based and how to effectively implement those principles and practices. We all have a responsibility to keep trying to help people appreciate these ideas, especially an understanding of the systems view of organizations. For from that idea, we can derive everything else. John Woods jwoods@execpc.com ====================================================================[Topic List] [Next by author] [First of thread] [First by author]
Wed, 26 Jun 1996 13:41:07 -0500
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I would like to pursue this a little further if we can. Yesterday I
was talking with a Vice President of Customer Service, and Stragetic
Planning for a rather large temporary service company in Atlanta. He is
interested in optimization, but doesn't really understand it. I had send
him the two articles I have written on the subject of competition and
measuring perfromance.
One of the articles has an example regarding ranking plants. He opened
the conversation by stating that he didn't agree with my point on ranking.
In the course of our conversation I determined that he has recently
instituted just such a policy at his company where all the branch offices
are now ranked. He also made the statement that figures don't lie, and that
with these figures he will be able to tell which are the best run operations
and which are the worst. Since he had the article on performance appraisals
in which I show that while there is variation in performance, all of the
variation is within the control limits and is the random variation being
caused by the system, I suggested that we might do a control chart using his
figures for the branches to see if there were any outstanding branches, or
would the chart only show the common cause variation being caused by the
system. He resisted this, saying that he only had two quarters of data and
doubted that it would be sufficient.
My problem is how to break through the wall and get him to look at
things from a different perspective. The comments by Anton Tolman, and Joe
Castellano are very appropriate here. He has learned the way it should be,
and is not very willing to listen to an outsider who is questioning some
recent changes he has made. The objective here is to turn him on without
turning him off. Any ideas?
Robert Crow
President, The Crow Group
jr1crow@mindspring.com
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Wed, 26 Jun 1996 13:58:19 -0400
[Next of thread] [Author List] [First of thread] [First by author]In a message dated 96-06-26 11:40:06 EDT, you write: >To: den.list@deming.ces.clemson.edu (Deming Network) > >I'm looking for DEN advice and direction on what Masters Programs are >available related to The System of Profound Knowledge. > >My questions are many and open to any new ideas you may have. Are there >any good distance learning programs? Are there any MBA or other >interdisciplinary programs that I can take courses in >philosophy/epistemology, psychology, variation, and systems theory? What >alternatives to an traditional MBA do I have? How do I find gold in >such a wide array of programs? What is good way to do research? I want >to explore and create new ideas with the System of Profound Knowledge >and at the same time get a marketable degree. Am I asking the right questions? ANY suggestions you might have would be greatly appreciated. > >Don Kerr ******************************* Don, You bet you are asking the right questions. I've just begun a Ph.D. at Walden University, There are a number of areas of focus including social change, psychology, theories of learning and motivation. One of the components is in general systems theory. I will be examining breath, depth, and application. I planning on examing the TQM movement and possible application to non-traditional schools. One of my mentors gave a presentation on TQM last night, including a video by Deming. I have been very satisfied by the program thus far. It's non-tradition education at its best. I believe they have an M.A. program. You would not want to make a final decision without looking at what Walden may have. For information, you can contact DKarnes@waldenu.edu. I'm sure he can answer your questions. Kind regards Myron Goodwin mgoodwin@waldenu.edu ====================================================================[Next of thread] [Author List] [First of thread] [First by author]
Wed, 26 Jun 96 14:15:35 EST
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This is my first post to the den. I have been reading the den for six
months and really enjoy the lively discussions. This is the second
request I have read for info on an MBA program on Dr. Deming's
teachings. I received my MBA in 1984 and I don't remember Dr.
Deming's teachings ever being mentioned.
Fordham University in New York has a Deming program that Joyce Orsini
can provide the info on. I do not have an e-mail or phone for Joyce,
but I am sure someone else on the den would have that info.
Marymount University in Arlington, VA has a TQM certificate program.
I don't know if it stresses Dr. Deming's teachings. Contact point is
Dr. Fry at (703) 284-5963.
Jim Martin
Board Member, Washington Deming Study Group
jmartin@lmi.org
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Wed, 26 Jun 1996 21:56:31 +0000
[Topic List] [Next by author] [First of thread] [First by author]Comments on Masters Degree on Profound Knowledge, Of course the answer to this has to come from those people being able t= o give authorized Masters Degree in Deming's Knowledge. Anyway, I want to give= a piece of hope to those who want to learn about Deming but can not liste= n to him in person any more. I have myself been waiting for distance educati= on in Deming's philosophy and in the meantime I keep on learning and applying= Deming, maybe more than I ever would do by carrying out a Master's Degr= ee. I attended Deming's four day seminars twice, -89 and -90. I shared some= letters with him, with more spiritual content than scientific facts. The Deming= advice that has meant most to me is: Show a positive, kind attitude towards anyone = wanting to learn. Keep learning all the time. Keep mind working. Read the book = and subject you feel important for the moment, even Spanish language of tha= t gets up to the "Pareto surface". If your logic is stuck and emotions are down: go to church, concert or = some other personal inspiring event. Often the body is lacking oxygen when we sit = here writing emails to the Clemson-host. Physical training: body building an= d jogging might be much more important than Out of The Crisis certain hours. Sometimes we must learn from the Japanese samurais to keep our brain in= a No Mind state, meditating, praying, filling ourselves with holy spirit etc= Marie-Louise expira@postbox.postnet.se ========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Thu, 27 Jun 1996 15:19:20 +0000
[Next of thread] [Next by author] [First of thread] [First by author]Robert Crow has a client who has just gone for ranking branch offices and asks for ideas on how to address it. Here is one approach. As the client has just made a decision to go for ranking, it will be counter-productive to pursue this aspect directly, so soon after the decision. This is why salesmen are taught not to criticise a product the client has just bought. The question is, Why does the client need to know who is best or worst? i.e. What is the purpose of the ranking. My guess is that he will explain that it is in order to make improvements, and this is where you can offer to help him. Unfortunately, of course, you may find that the competition that ranking introduces makes it more difficult to get branch offices to share their good ideas with each other (Why prejudice your chance of coming top?) You may also find that the competition causes the branch office to distort the data they collect in their own favour. Thus you can praise your client for wishing to manage by fact and manage on the basis of data. But then you need to help him collect that data and use it more effectively in the PDSA improvement cycle. Hopefully this will lead away from the use of data for ranking and a focus on process measures rather than results measures. Regards, Peter Walker. ------------------------------- Walker Associates Tel:+44 1908 510593 Fax:511772 ===============================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Thu, 27 Jun 1996 07:05:47 -0600
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To the Den List: Joyce Orsini's Address is:
Fordham University
113th 60th Street
New York, New York 10023
I also have her phone number but do not feel comfortable with giving it out
on such a public venue. My name is Bill Towns, I am at the University of
Kansas and my e-mail is wct@union.wpo.ukans.edu. I wrote my thesis on
Deming as an educator and am interested in any application of Deming's
principles to education. Thanks
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27 Jun 96 13:09:51 EDT
[Next of thread] [Next by author] [First of thread] [First by author]re: Diane Korzeniewski's question regarding "joy in work". Dr. Deming spoke about intrinsic motivation. I believe that this is a prerequisite to "joy in work". No matter what the task is, be it grand or mundane, if we are intrinsically motivated to do it we will experience "joy in work". In the absence of intrinsic motivation that same task becomes drudgery. Walter G. Prevalnig . Building Learning Organizations 104337.2101@compuserve.com ===================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Thu, 27 Jun 1996 21:44:52 +0100
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Diane Korzeniewski asks if we can estimate the percentage of productivity
that could be unleashed if management is successful in creating an
environment conducive to pride and enthusiasm.
I don't think we can, because the long term effects are much greater
than the short-term effects: and above all, it depends what we include
in "Productivity"
In a sense, management has gone through three stages:
1 Productivity in the sense of total volume of production is everything
2 Quality matters more than crude numbers: it affects profits more
3 Creativity, including innovation in product and process, and the
ability to respond to a rapidly changing world, are most important
of all. Who needs the world's best stage-coach?
People can, and sometimes do, work under miserable conditions and still
produce quantity. They are less likely to produce quality: that requires
intelligent application. And they cannot produce innovation: they will
fight every change, knowing they will never gain from it.
So if you measure on the ultimate scale, long run survival, the benefits
of joy in work are too large to measure. On the crude numbers scale, they
may be less impressive in the short run.
David Kerridge
BDA Scotland
dfk@abdn.ac.uk
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Thu, 27 Jun 1996 22:01:08 +0100
[Topic List] [Next by author] [First of thread] [First by author]Bill Cooper suggests that Dr Deming did not say enough on leadership. I think he did, but we may not recognise it. In many things, Dr Deming did not tell us how to push the system towards the desired result, whether quality, or profitability, or in this case leadership. What he showed us was how to remove the obstacles, so that the things we desire may flourish. This is an important change of view. Most people, leaders as well as workers, would rather do a good job than a bad job. Under the present system, managers are overworked, overstressed, and naturally cannot do the good things that would help everyone else - like learning new ideas. Just take a few "Deming" ideas. Stop reacting to common cause variation, and you have more time, and less stress. Have fewer suppliers to deal with, and the manager has fewer disputes to resolve, and muddles to sort out. These are not the only reasons for changing to the new ways, of course. We usually stress the benefits to quality or to the workers. But the whole basis of the Deming Philosophy is "Everybody wins". I believe the answer is that the 14 points are (among other things) a way to produce leadership. The old systems destroy leadership as surely as they destroy motivation, quality, and profits. David Kerridge dfk@abdn.ac.uk ========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Mon, 1 Jul 1996 19:50:45 -0400 (EDT)
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The key word is new. I often try to impose my will on others. It
may be beneficial to establish a good working relationship before exhibiting
an aggressive new idea. The person on the receiving end of this new idea must
have status of some type. People in authority fall victim to status
equalibration, Dr. M. Sherif's term for people who have status in one aspect,
who desire to have it proportionally in all.
A conflict develops when a side seeks to impose it's will, or gain
advantage over others. You will build temporary coalitions of strange
bedfellows who will unite in opposition to you. This situation is at best win
lose. It could have many losing sides, with none winning.
Keep in mind that the key is allowing all parties to save face, win,
if you will. This will stabilize the relationships. As Dr. Deming says,
it is important to have long term relationships.
Listen a lot. It is unwise to pour anything in to a full container.
Be patient, let people talk themselves out. Let them empty themselves of all
of their arguments, then let them have time to think of more. This is not
High Noon. It is difficult to listen. Let people have time to think,
or they will think about what they will say next when you are talking,
and ignore all your hard earned knowledge.
You can lose a few battles and still win the war.
Is this leadership ?
Thanks,
John
jkaliste@skipjack.bluecrab.org
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Tue, 2 Jul 1996 16:20:06 -0700
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I have been following the Profound Knowledge and Qualification vs
Understanding discussions with interest, and let me offer two models:
Star Trek analogy
Robert McNamara's "In Retrospect"
The Start Trek analogy was taught in a management course at the Navy
Officer Candidate School when I attended in 1981. Briefly, the idea
is that "Dr. McCoy" represents the emotional/experiential point of
view - all of his solutions are based on feelings and gut reactions.
On the other hand, "Mr. Spock" represents pure logic - or the use of
data (and the theory of variation in our context). Neither approach
works well stand-alone, but our hero, Captain Kirk, is able to bring
the two differing approaches together for a well-rounded answer to the
crisis at hand. The Navy did not refer to this as "profound
knowledge", but I think this model may be useful.
I believe that Robert McNamara's "In Retrospect" contains important
information on over-reliance on data in decision making. I know that
in my current job I am attempting to swing managers away from strictly
"gut reaction" decision making, to including data in their decision
making process (and the theory of variation). However, I am mindful
not to overswing the pendulum as Mr. McNamara did.
[Another Navy story] While I was at Naval Postgraduate School for an
MS in Operations Research, there were frequent references to Robert
McNamara and how he gave operations research a bad name by
over-reliance on data, without taking into account the experiences of
senior military leaders. I have found reading "In Retrospect" a
worthwhile experience, and I think by negative example, he points out
the need for "profound knowledge".
I do think it would be very worthwhile to put the question of profound
knowledge to Mr. McNamara, if possible. His book appears to catalog
the shortcomings of the decision making process during the Vietnam
war, but doesn't appear to offer an answer. But I still recommend the
book, if only as a unique example of going too far with data, without
considering the human element.
- Steve Prevette
Performance Measures Consultant
Westinghouse-Hanford Corp.
509-373-9371
steven_s_prevette@rl.gov
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02 Jul 96 11:38:39 EDT
[Next of thread] [Next by author] [First of thread] [First by author]Ned Namson wrote: < In the absence of intrinsic motivation.....which was made concerning Dr.Deming and joy /pride in work statements. This confused me a bit. Intrinsic motivation is internal motivation,no?.......> Ned, I concur with your comment and apologize. In the interest of brevity I erred in not providing an operational definition for my use of the term " intrinsic motivation". For this posting I used the term "intrinsic motivation" to represent that part of the internally generated frustration signal that starts us behaving to get what we want. Recognizing that all behaviour is internally motivated , the purpose of my posting was to make the point that if I choose to perform a task because it gets me what I want and is therefor needs fulfilling, I experience "joy in work". If I choose to do the same task due to an external condition such as fear ( if I don"t do it I loose my job, etc.) then that same task becomes drudgery. Walter G. Prevalnig, Building Learning Organizations 104337.2101@compuserv.com ==========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Tue, 2 Jul 1996 13:42:21 -0400
[Next of thread] [Author List] [First of thread] [First by author]Someone asked a few days ago, "Isn't intrinsic motivation the same as internal motivation?" Therefore, isn't it always present? No, intrinsic motivation does not refer to motivation that lies within you, but motivation that lies within a particular task. For instance, if you love to compose music because you love to compose music, you find motivation to compose intrinsic to the task. On the other hand, if your motivation to compose music comes from outside of the task -- you see composing as a means to fame, fortune and women -- you are extrinsically motivated. Your motivation to compose music lies outside the task. Students could learn how to calculate acceleration because they want an "A" or because they are genuinely fascinated with free-fall. Who do you think is more likely to "play" with the concepts enough to arrive at an innovative approach? Repetitive jobs can easily be shipped overseas to be worked by Vietnamese making $30 a week. So, we need to ask ourselves whether we're using work and learning methods that lead to expected or innovative results. Repeatedly, research concludes that extrinsic motivation stifles innovation and intrinsic motivation stimulates it. Someday this simple concept with be both widely known and widely accounted for in the design of work and learning. Until then, we'll continue to wonder why our median incomes rarely rise and our trade deficit rarely falls. -- Ron Davison (RonDavison@aol.com) =========================================================================[Next of thread] [Author List] [First of thread] [First by author]
02 Jul 96 10:05:00 -0500
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From: John Hunter
To: All
Subject: Deming Questions # 18
>>> Dr Yoshio Kondo, Professor emeritus, Kyoto University, said that
there are three concepts of product quality: (1) conformance to
specifications, (2) satisfaction of the customer, (3) amazement of
the customer. What is the best one to keep faithful customer?
Jean-Marie Gogue <<<
Amazing the customer is the best way to keep repeat customers. Satisfying
them is good but if they see an alternative that is cheaper or may be
better
or if you make a mistake (introduce a new product they don't like, raise
prices at the wrong time) they may well leave. If they have been amazed
by
your past service they are unlikely to leave for a slightly lower price,
or a
new competitor or a new product/servcie similar to yours or if you make a
mistake.
John Hunter
wdsg@aol.com
http://pages.prodigy.com/john/hunter.html
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|PerMaNet : The TQM BBS 11:202/299
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Wed, 3 Jul 1996 07:22:22 -0400
[Topic List] [Next by author] [First of thread] [First by author]Walter: Thanks for the added explanation on intrinsic. The point you make is right on target with the added explaination. Fear, of course, not the only roadblock to joy/pride in work/task. Everyday hassles caused by out of control "little" processes, as well as the main or big processes also sap energy. I prefer to use the word "task" for things I must do in my part of the process of serving cuustomers. Acheiving joy in task is not difficult. When big and/or little processes are out of control parameters, my tasks become "work." Cheers, Ned Hamson, editor: The Journal for Quality and Participation - Association for Quality and Participation, 801-B W. 8th St., Suite 501, Cincinnati, OH 45203 Tel: 513-381-1979 Fax: 513-381-0070 - e-mail: ParetoKid@aol.com "This is the time... We are the people... Let's work together... Now!" Ned Hamson "Always do right. This will gratify some persons and astonish the rest." -- Mark Twain http://newciv.org/worldtrans/comqual.html European representative: Peter Beerten, Belgium Consultancy Group: Tel: 011-32-02-569-0222/Fax: 011-32-02-569-7480 - e-mail: Peter.Beerten@ping.be Woe, 03 jul 1996 ========================================================================[Topic List] [Next by author] [First of thread] [First by author]
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I doubt that people will change an accepted point of wiew
unless they believe that they will benefit from it.
So you have to be persistent. Try to make him see
the results that his company could make with another point of =
wiew.
You might need examples. Many executives don't accept theory on=
ly
ecpecially when it goes against "common knowledge".
Marie-Louise Thors=E9n Lind
The Swedish Employers Confederation
marie-louise.thorsenlind@notis.postnet.se
______________________________Svarsavskiljare _________________________=
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Wed, 03 Jul 96 10:17:24 EDT
[Topic List] [Next by author] [First of thread] [First by author]*** Reply to note of 07/02/96 21:57 Alan Crudden INET: agc@vnet.ibm.com | (203) 973-7143 | 290 Harbor Dr. IBMMAIL: USIB49ZM | T/L 342-7143 | Stamford, CT 06904 |FAX T/L 342-5465 | Subject: Robert McNamara Re: Steve Prevett's post on over-reliance on data The problems of McNamara, et al seemed to be (from my readings) not so much a reliance on data but in using measurement as a "management system" and not as a *tool* for helping to understand the management system itself. His methods seemed to encouraged deceptive practices so that quotas and targets could be achieved. At one point in Vietnam, I read, enemy body count quotas weren't being met so a new method was instituted: count an abandoned rifles as the equivalent of a "kill". The rationale(?) behind this was that no good, live soldier would leave his gun behind. I recommend David Halberstom's "The Reckoning" for more on McNamara's work and its specific impact on the automotive industry. Alan ====================================================================[Topic List] [Next by author] [First of thread] [First by author]
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I am on vacation with my wife this July and wondered if any of your Deming
circles were having meetings when we were in your area. I see so many
interesting topics being discussed and would love to attend a session.
We will be in Seattle 19th and 20th July then travelling down to San Fransico
for 26th and 27th.
Please let me know if there are any meetings on those dates that we may be able
to attend.
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Fri, 5 Jul 96 13:25:18 UT
[Next of thread] [Next by author] [First of thread] [First by author]In regard to the posts on intrinsic motivation, I wonder where "the love of music" that is "intrinsic to the task" comes from. What I am getting at here is the need for Deming practitioners to gain knowledge of how one may go about identifying the most appropriate job assignment for a particular individual in the workplace. Obviously, being placed in (or selecting) a vocation in which one finds such intrinsic motivation would be highly desirable. I know many lawyers who are miserable in the practice of law and wish they had chosen something else as a profession. These are bright people who plunged into a lifelong pursuit, perhaps without full knowledge of what it was really like to be an attorney (how could know?). Many now feel that they have invested far too much of their lives in law practice to change now. I also know engineers and physicians with similar intrinsic motivation problems. I am aware of Briggs-Meyers and other means of choosing a vocation. Do tests these enable one to select a job that will have inherent intrinsic motivation for the individual or is this an area of psychology requiring more research before we have a useful tool? These are, I'm sure, elementary questions for many on the DEN, but I wonder if, when discussing intrinsic motivation versus extrinsic motivation, we ask the question, "Is it possible to find intrinsic motivation in life itself and, therefore, find intrinsic motivation in almost any job we do?" In other words, Dr. Deming's "joy in work" - is it more from offsetting (or eliminating) the "forces of destruction" in one's life or is it the result of some unexplained natural proclivity toward "a love of music", or law, or medicine, or whatever we love to do? In my opinion, this discussion has great implications for the implementation of The Fourteen Points and is but one of many reasons for SPK. Without a knowledge of psychology, one cannot successfully implement The Fourteen Points. An example one could give is that of an engineer desiring to design an airplane. In order to come up with a successful design, the engineer must possess a knowledge of geometry, algebra, calculus, statics, dynamics, mechanics of materials, fluid mechanics, aerodynamics, and a host of other things. These could, I suppose, be an equivalent to SPK for designing an airplane. In other words, SPK is something akin to what knowledge an engineer would need to design an airplane, but involves what a manager would need in order to implement The Fourteen Points. If any piece of the required knowledge is missing, the engineer does not come up with a successful aircraft design. Correspondingly, if any piece of SPK is missing, successful implementation of The Fourteen Points is unlikely for the manager. The need to get at the depths of the origin of intrinsic motivation is great. Any thoughts? Patrick Owings ==========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
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[Topic List] [Next by author] [First of thread] [First by author]Bill: I heard about the proposed Deming stamp. Can you send info on status, timing, addresses, etc. Thanks, Jack R. Stokvis[Topic List] [Next by author] [First of thread] [First by author]
Fri, 5 Jul 1996 11:53:16 -0400
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The posting by Patrick Owings makes some very important points.
I believe there is a balance to be maintained within everyone between
the intrinsic and extrinsic motivation. The extrinsic motivation for
me and many of my coworkers is money (we need to make a living) and
career advancement ( to assure that we continue to make sufficient
amount of money to live and support our families). However if these
were the only motivations present then why not attempt to achieve
these through illegal activities or some other means that simply
provides lots of money to support our lifestyle.
The intrinsic motivation which provide joy, and satisfaction in work
keep us doing what we like to do. It must be sheer drudgery to have to
work at a job (lawyer, doctor) and not find some intrinsic motivation
in the tasks performed. I'm sure doctors must derive some great joy
and satisfaction at saving lives and healing the sick. Lawyers also
must find satisfaction and joy in helping people and businesses
resolve issues and conflicts within the legal system.
Regards,
Shane O'Donoghue (smodonoghue@cbs.com)
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Fri, 5 Jul 1996 18:08:25 -0400 (EDT)
[Topic List] [Next by author] [First of thread] [First by author]Linda & Bill, The following message describes the 'Newt Project' I thought the Board would like to see what we can and are doing via the DEN. This is becoming a more formalized project and I was wondering is a project sheet needs to be done and forwarded to the board (?) I just sent a copy to Gipsie, then remembered she is moving and may not have net access yet. Jim Clauson DEN Moderator Forwarded message: > From Donald.Kerr@alliedsignal.com Fri Jul 5 17:28:17 1996 > Message-Id:[Topic List] [Next by author] [First of thread] [First by author]> From: "Kerr, Donald" > To: John Seddon <101454.573@compuserve.com>, > Myron Tribus > <104055.2663@compuserve.com>, > Anton Tolman > , > Bill Cooper , David Kerridge , > Ian Bradbury > > To: Jonathan Siegel , > John Paul Fullerton , > Wayne Levin > , > Matt Barkley , Patrick Owings , > Rip Stauffer > To: Stan Adams , john hunter > Cc: "clauson@deming.ces.clemson.edu" > Subject: DEN RACR Plan > Date: Fri, 5 Jul 1996 14:26:00 -0700 > X-Mailer: Microsoft Exchange Server Internet Mail Connector Version 4.0.838.14 > Encoding: 106 TEXT > > Dear DEN RACRs, > > I wrote up a quick proposed plan (prediction, theory) to get us going > around the first cycle of the PDSA...check it out and give me any > comments. > > Thanks, > Don > > > Team: Renewing American Civilization Review (RACR) Project Team > > Sponsor: W. Edwards Deming Institute- Deming Electronic Network > Customer: Newt Gingrich and The Progress and Freedom Foundation > > Purpose: To cooperate with Mr. Newt Gingrich and The Progress and > Freedom Foundation in the advancement of the teaching's of W.Edwards > Deming toward the renewal of American Civilization. > > Product: Complete electronic review and report of the 1995 The Renewing > American Civilization lectures by Newt Gingrich, based on the > foundational principles of W. Edwards Deming. The electronic report > will delivered on 1/97 to PFF at RENEWAM@aol.com. > > Other Potential Services (Voluntary): A follow up oral presentation, > consultation, and/or facilitation support for future the "Quality As > Defined By Deming" classes. > > Team Objectives: > - To analyze and synthesize the complete series of 10 lectures found at > http://www.pff.org to avoid out-of-context misunderstandings > - To provide non-partisan feedback to Mr. Gingrich based on the > foundational principles of W. Edwards Deming. > - To encourage and support the continuous improvement of the Renewing > American Civilization course, especially the "Quality as Defined by > Deming" class. > - To engage in dialogue with Mr. Gingrich with the hope of continuously > improving his understanding of The Deming Philosophy and The System of > Profound Knowledge. > - To engage in dialogue with Mr. Gingrich to continuously improve our > understanding of the foundational principles for Renewing American > Civilization. > - To make a collective and constructive contribution to Renewing > American > - To open up the possibility of future cooperative projects > (Presentations, Consultations, class facilitation, etc.) between the W. > Edwards Deming Institute and the Progress and Freedom Foundation. > > The Plan: > Each DEN-RACR Team member will be responsible to read all 10 lectures > (minimum of 5) over a six-month period (July-Dec96). Emphasis will be > placed on the Five Pillars (lectures 1-5) and their interdependencies. > Lectures 7-10 will be optional and addressed as time permits. > > Schedule- > July 96 > Lecture 1- American Civilization > Lecture 6- Pillar 5- Quality as Defined By Deming > August 96 > Lecture 2- Pillar 1- The Historic Lessons of American History > September 96 > Lecture 3- Pillar 2- Personal Strength > October 96 > Lecture 4- Pillar 3- Entrepreneurial Free Enterprise > November 96 > Lecture 5- Pillar 4- Spirit of Invention and Discovery > December 96 (Optional) > Lecture 7- The Third Wave and American Civilization > Lecture 8- Creating American Jobs in The World Market > Lecture 9- Replacing The Culture of Violence and Poverty with a Culture > of Productivity and Safety > Lecture 10- Citizenship And Community In 21st Century America > January 97 > Final Review and Synthesis > Final Report delivered to Progress and Freedom Foundation (PFF) > > > The Five-Step Process: > > 1) You will read the Pillar-Of-The-Month, according to the above > schedule. > 2) You will provide one individual report per Month to me documenting > your initial comments, concerns, strengths, and weaknesses for each > Pillar-Of-The Month. DUE-on or before the last Friday of each month. > 3) Any time during the month,as I receive each of your reports, I will > post them to the rest of the team for comments,dialogue and team > learning. > 4) The last week of each month I will summarize the collected reports > and comments and post it for your review. I will also post it to the > DEN as a team status. > 5) I will synthesize each Pillar-Of-The Month summary into a Final > Report and post it for your final review and comments. This Report will > then be E-Mailed to Mr. Gingrich. > > Next Steps: > 1) Provide feedback to me on this plan > 2) Read Lectures 1 and 6 and send me your individual report no later > than July 26...hopefully sooner. > > Have a Great Adventure! > Don Kerr > > p.s. Ian Bradbury's address is the only one that bounces. Does anyone > have his address or know what's wrong? > > > --
Sat, 6 Jul 96 10:20:43 +0200
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-------------------------- DEMING QUESTIONS --------------------------
A weekly paper including a set of questions copied in the Deming book
OUT OF THE CRISIS Chapter 5. Questions to Help Managers.
By Jean-Marie Gogue
-----
# 19
-----
1. (No 37 in the Book) - Exploring the future business
a) Who makes the decision about whether to buy your product?
b) What new design would serve better four years from now?
COMMENTS
These questions are the most important and the most difficult to answer.
If a company can predict that a new design will result in tremendous
sales, they are nearly invincible. But neither in 'Out of the Crisis' nor
in 'The New Economics' Deming provides a solution.
Let's come back to the C. I. Lewis' statement : *Knowing begins and ends
in experience; but it does not end in the experience in which it begins*.
Knowledge is prediction. When a company has made the Deming transformation
the capital of knowledge is cultivated with great care, for everybody has
understood that it's the most important resources. When knowledge improves,
the ability to predict the future business improves.
-----
2. (No 38 in the Book) - The inspection status in your company
a) What inspection or verification are you carrying out
on incoming materials?
b) What inspection or verification are you carrying out
in process?
c) What inspection or verification are you carrying out
on final product?
COMMENTS
Inspection is necessary, inspection must be documented by procedures,
but inspection must not be installed for ever. Remember point 3 :
*Cease dependence on mass inspection*.
Some organizations suffocate to death under layers of inspections that
settled year after year, like geological layers.
----------------------------------------------------------------------------
Jean-Marie Gogue
President
The French Deming Association
Versailles France
gogue@ensmp.fr
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Fri, 12 Jul 1996 00:34:58 -0400 (EDT)
[Topic List] [Next by author] [First of thread] [First by author]Fellow DEN'ers, WHY SO QUIET? Yes, things have been quiet for the last week. Special cause: I had to make an unplanned road trip to Chicago and was unable to access the net from 05JUL-11JUL. I will clear the message queue tonite. For those of you who sent me back-channel messages, I will respond to those as well. RE: MESSAGE VOLUME: Over the last month, the DEN has averaged about 140 messages/month or 4-5/day. Unless there is a special cause (like the one noted above) you should receive a fairly steady, daily flow of messages. RE: BOUNCED MESSAGES (or those the net cannot deliver and are returned to me): I will usually not manually unsub anyone, unless messages to them bounce chronically. However, the system here at Clemson *does* have an "auto-delete" feature which *can* automatically delete your address for mail bounces. WHY AM I TELLING YOU ALL OF THIS? If you see a drop in messages for a while, you may have been auto-deleted. If you stop getting messages, send me an e-mail at clauson@deming.eng.clemson.edu and I will look into it for you. Thanks, **************> Moderator, Deming Electronic Network <*************** * Jim Clauson, Director Phone (W): +1 423 882 4611 * * Quality Training Programs Phone/FAX (H): +1 423 717 0250 * * Center for Quality & Innovation clauson@deming.ces.clemson.edu * * Roane State Community College den_moderator@a1.rscc.cc.tn.us * * Harriman, TN 37748-5011 clauson_jr@a1.rscc.cc.tn.us * ******************> Primary Listowner, TQM-L <*********************** =====================================================================[Topic List] [Next by author] [First of thread] [First by author]
Mon, 8 Jul 1996 13:20:02 -0400
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I have been following this thread with considerable interest. Especially
interesting to me are the answers from Bill Latzko, and several dealing with
Don Wheeler's advanced book.
As I understand it, p- and np- charts are used for data characterized by the
binomial model. Wheeler and Chambers, in Understanding Statistical Process
Control , point out that there are four conditions which must be met in order
for the count to be characterized by the binomial model:
"1. The area of opportunity for count Y must consist of n distinct items.
"2. Each of the n distinct items must be classified as possessing, or not
possessing, some attribute. This attribute is usually some type of
nonconformance to specifications.
"3. Let p denote the probability that an item has the attribute being
counted. The value of p must be the same for all n items in any one sample.
While the chart will check if p changes from sample to sample, the value of p
must be constant within each sample.
"4. The likelihood of an item possessing the attribute will not be
affected by whether or not the preceding item possessed the attribute.
(Nonconforming items do not naturally occur together in clusters, and counts
are independent of each other.)"
The book goes on to say, "When these four conditions are satisfied by
the count data, it is feasible to use a Binomial Probability Model to compute
limits for the sequence of observed values Y1, Y2, Y3,... . That is, we may
use the known relationship between the Mean of the Binomial Distribution and
the Standard Deviation of the Binomial Distribution in our computations...
"The reader should notice that the symbol n is used here to denote the
Area of Opportunity for a Binomial Count rather than the subgroup size (the
number of values used to compute an average). The Binomial Count, Y, is an
Individual Value, and there is exactly one count per 'subgroup' ."
As I understand the way count charts work, the assumption of the
distribution is very important. While Shewhart, Deming and Wheeler have all
shown that the shape of a distribution for an averages chart with three-sigma
limits doesn't usually matter (and process knowledge is of utmost importance
in any case), count chart control limits are based on the assumption that one
has a coherent probability distribution (binomial for p- and np-; poisson for
c- and u-).
This seems to be an advantage in some cases, and a disadvantage in
others. In the case of the TNE data, I got the following results (results
rounded to the nearest 1/10 of a bead):
Newport Beach Nashville
Xbar(npbar) 9.5 9.4
mRbar 2.2 3.8
UNPL 15.2 19.4
LNPL 3.7 0 (-.7)
UCLmR 7.1 2.4
UCLp 17.8 17.7
LCLp 1.2 1.1
I got slightly different results from Bill Latzko--I'm not sure why
(note that I used Wheeler's convention of UNPL/LNPL for Upper/Lower Natural
Process Limit for the individuals chart). The overall message is the same,
however: in both sets of calculations, the XmR chart shows a difference in
dispersion whereas the np chart shows about the same dispersion. This is
because the np chart is based on the average value, essentially the same in
each case.
In this case, of course, the results from the np-chart are probably not
suspect. The Bead Bowl is, certainly, about as close to a binomial model as
we are likely to get in the real world (therein lies its immense power to
convince the skeptic). The question is, what is the source of the difference?
Shewhart said if an average and range chart with subgroups of size n=4
has at least 25 consecutive subgroups which do not indicate any lack of
control, then the process may be said to display a reasonable degree of
statistical control. Wheeler has an extensive discussion of degrees of
freedom for various charts in his Advanced Topics book (he gives an
approximation for degrees of freedom thus: DoF is approximately equal to
.9k(n-1)). Studying these two references leads me to beleive that we don't
have enough data with 24 to provide "solid" control limits.
We know, however that we have a repeatable process. We know, by
design, it is highly unlikely to display a lack of control (empirical
evidence bears this out, also).
Given the same paddle, bowl, instructions, etc., two teams should give us
equivalent results. Using these assumptions, I appended the Nashville data to
the Newport Beach data set and came up with the following:
Xbar(npbar) 9.4
mRbar 2.9
UNPL 17.2
LNPL 1.7
UCLmR 9.5
UCLp 17.7
LCLp 1.2
In this case, using 48 data from essentially the same process, the XmR limits
come within half a bead of the np limits. I believe if we had 100 data, we
could probably come within 1/10th of a bead (not that ".4 beads" has any
meaning in the real world, other than a measure of discrimination for
determining on which side of the line an integer will fall).
The reason we can make these statements, though, is WE HAVE PROCESS
KNOWLEDGE. We know the Red Bead experiment. We would be astonished to find a
lack of control in it. After seeing it over and over, we would be surprized
to see control limits other than 1and 18.
So, which chart is better? It seems that, given enough data and a
process which fits the criteria for the probability model, either one will
do. However, lacking in-depth process knowledge, I would go with the XmR, as
it seems to better reveal the dispersion in the system. If the process is not
characterized by a binomial or poisson model, the dispersion is coming from
something other than a theoretical curve, and reduction of the dispersion is
important. If the process is characterized by a binomial or poisson model,
reduction of dispersion will only come about through reduction of the process
average.
I would also like to suggest using variables data vice attribute
data wherever possible. Variables data lend themselves to continual
jmprovement much more than do attribute data. They are more discriminate,
less aggregate and contain more information.
Finally, I would like to add my voice to the rest of those
recommending Dr. Wheeler's books. He has done a lot of research to further
Dr. Shewhart's work.
Rip Stauffer
Naval Leader Training Unit
Ripstaur@aol.com
(P.S. Sorry for the long post. This issue seemed too complex for a simplier
response than this.)
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08 Jul 96 10:38:24 EDT
[Next of thread] [Next by author] [First of thread] [First by author]Patrick Owings raises an interesting question regarding internal motivation with regard to love of music. Paul Robertson has authored an interesting little booklet "Music and the Mind" which reviews data on how the human mind responds to music. In it he discusses findings about neural activity related to musical tones, the ability to discriminate music from noise, the need for rhythmic beats, etc. A new organization has been formed, The Music Research Institute, which has an e-mail address, 100534.476@compuserve.com He says that there isn't much published except on the internet! Internal motivation is, indeed, a complex issue and we should be grateful to Patrick Owings for raising the right question. More and more I am coming to believe that education is less a matter of knowing answers to stock questions but more the ability to phrase useful questions and then knowing how to go about finding answers. Myron Tribus ============================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Sun, 7 Jul 1996 11:26:43 -0400
[Topic List] [Next by author] [First of thread] [First by author]In a message dated 96-06-18, Ian Griffiths wrote: << Dr Deming insisted on the importance of evidence -- without which you cannot test a theory. A theory incapable of refutation has no value. What I think Dr Deming meant by 'not looking for examples' is that a few supporting 'case histories' are not a good enough test of a theory. A few such cases provide plausibility. That should encourage deeper exploration -- not premature relaxation of our efforts to probe deeper. In practice this is really tough, given the pressures that managers are under. >> This strikes me as a superb bit of explanation for this point. Imagine what might have happened at the Hawthorne plant had the researchers relied only on the first results in testing their theories, and no one bothered to say, "Hey, let's check out the other side of this thing--lets turn the lights back down and see if productivity goes back down." Thanks, Ian. Rip Stauffer TQL Division, Naval Leader Training Unit Ripstaur@aol.com ========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Thu, 11 Jul 1996 16:22:23 +1000 (EST)
[Next of thread] [Next by author] [First of thread] [First by author]I have not been able to find any answers in the general literature & hope that some of the assembled expertise might be brought to bear. 1. Skewed distributions and the Empirical Rule When using an individuals chart with a distribution having a long tail, one can come up with a negative lower control limit. For example, one might be tracking sales per day, where there is a large proportion of low values and a few relatively high values. In this case, is the control chart of any use in identifying special causes on the low side? If one recorded three consecutive zeroes, would one advise the manager not to intervene? How can one use a control chart to detect a meaningful falling off of sales? Should one look at e.g. elapsed time between sales? 2. Pareto charts and population distributions It is common practice to use Pareto charts to stratify data to determine an area in which intervention may be beneficial where variation is all common cause. There is no mention of doing a control chart to see whether the Pareto item is a special cause relative to the underlying process. On the other hand, Deming advises us not to take action [on people] based on a ranking within a common cause distribution. What is the fundamental difference between the two scenarios? 3. Alternative tools for problem solving Intellectually, I find the fishbone diagram to be the least satisfactory part of the quality improvement toolbox. I appreciate the need to focus the analysis in the context of a ÒQC StoryÓ or similar methodology. However, having got to the point of identifying the problem area by statistical means, is there any reason why one should not substitute an alternative problem solving framework, for example causal loop diagrams, systems dynamics models, or even a Kepner Tregoe Òis / is notÓ problem analysis? Regards Robert -- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Robert Lamb rlamb@netspace.net.au Melbourne, Australia Life isn't meaningless: it just has a poor signal to noise ratio. ======================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Tue, 09 Jul 1996 12:06:04 -0700 (MST)
[Topic List] [Next by author] [First of thread] [First by author]On July 5th, Patrick Owings continued the discussion on intrinsic motivation and asked some questions: > I am aware of > Briggs-Meyers and other means of choosing a vocation. Do tests these enable > one to select a job that will have inherent intrinsic motivation for the > individual or is this an area of psychology requiring more research before we > have a useful tool? Patrick, the Meyers-Briggs is a test based mostly upon Jungian personality theory; it is not a test specifically designed to help match individuals to work assignments or vocations, although it is widely used in industrial circles in applications for which it was not originally intended. (I am a little out on a limb here because I am not a specialist in vocational counseling and am not up to date on the most recent literature). There are other tests, such as the Strong-Campbell interest inventory which _were_ designed specifically to try and match people's reported natural interests with vocational possiblities. There are several other newer tests out which purport to achieve the same end. I can get names of these other tests for you if you like. I think that these types of tests are useful tools for helping someone narrow down their options and examine what they consider to be their interests and try to match those interests with available options. However, I also believe that there may be times when the person thinks that they would enjoy X, only to find after doing X for a while that they really don't like it. As far as I know, there is no test to determine what someone might really like that they are unaware of. However, personality tests like the Rorschach, which are again designed for personality assessment not job-matching, provide information about personality styles that taken with a vocational interest test might prove very useful indeed. Intrinsic motivation, to me, comes from a combination of natural, perhaps genetic or biological "action tendencies" or preferences (for degree of stimulation, amount of people interaction, etc.) which are shaped by environment and exposure, mostly by parents' own preferences and opportunities provided to the child, and conscious decisions. When we are engaged in tasks which match our preferences, but which we also find stimulating, rewarding (by whatever definition), and worthwhile, I would say that we experience intrinsic motivation. Studies on "flow" or maximum work performance indicate that we know we are flowing when time seems to go by very quickly and we are "lost" in what we are doing. Studies indicate that the flow state is perceived to be highly motivating and that mood is at a peak when we are in a flow state. When we are engaged in non-flow activities, we tend to feel frustrated, irritated, or that we are performing routine drudgery. In fact, if you consider the effect of teaching line workers how to relate to their work in a new way -- via control charts, understanding of variation, etc., you may be creating new opportunities for individuals who had looked at their work perhaps as drudgery, to become more stimulated, to become more "lost" in their work and improve their morale and intrinsic motivation. (By the way, the lowest mood ratings were obtained when people were watching television). > "Is it possible to find intrinsic motivation in life itself and, > therefore, find intrinsic motivation in almost any job we do?" In other > words, Dr. Deming's "joy in work" - is it more from offsetting (or > eliminating) the "forces of destruction" in one's life or is it the result of > some unexplained natural proclivity toward "a love of music", or law, or > medicine, or whatever we love to do? I think that there are those individuals who are predisposed or whose natural preferences are so broad that they find pleasure in many different things and can find intrinsic motivation in almost any task they perform. These individuals, as long as they are able to manage or eliminate the irrational thinking and some of the other thought processes that interfere with adaptation to life that I've described on the DEN before, might be described as finding intrinsic motivation in life itself. For others, who by temperament, genetics, or lack of early exposure to novel situations and a wide range of possibilities, may have limited preferences, I think the job of becoming intrinsically motivated is more difficult. Nothing is impossible, but I believe that people range on a continuum for this element. Perhaps part of understanding the psychology section of SPK and applying it to the system is to reach out and assess where our people fall on this and on other continua so that we can better match their skills and preferences to their work assignments, maximizing their potential and joy in work. What do others think? ________________________________ Anton O. Tolman, Ph.D. Director, Psychological Services Director, Program Services Wyoming State Hospital P.O. Box 177 Evanston, WY 82931-0177 Anton@wsh.state.wy.us (307) 789-3464 --------------- =========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Thu, 11 Jul 1996 08:31:33 -0700 (MST)
[Next of thread] [Next by author] [First of thread] [First by author]I am constructing some control charts to examine patterns in our overtime usage during two different phases of how we have done scheduling -- centralized scheduling and unit-based scheduling. We have 16 data points (representing a week's worth of data) for 5 units across each time period. This is how I am going about it: Use subgroups of n=5 (we have 5 treatment units) and look for variation across the weeks (since we are interested in the time comparison). The first control chart was on all 32 data points. It showed,remarkably enough, that there were no (other than maybe the very first point) out of control points. My interpretation of this initial data is that the system appears stable regardless of which scheduling pattern we are using. Would that be a reasonable conclusion? My next step is to create mini- charts for each time period, mostly to see the size of the sigma limits under the two conditions. Comments? I am also starting to look at the data itself to look for patterns in the run using Wheeler's 8 points on one side of the line suggestion. My last question is should I also use some of the more complicated run tests (e.g. 2 out of 3 successive points more than 2 sigma units from the central line)? I would appreciate any advice you could give. ________________________________ Anton O. Tolman, Ph.D. Director, Psychological Services Director, Program Services Wyoming State Hospital P.O. Box 177 Evanston, WY 82931-0177 Anton@wsh.state.wy.us (307) 789-3464 --------------- ========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 12 Jul 1996 15:18:10 +0500 EST
[Next of thread] [Author List] [First of thread] [First by author]I do not understand how you can define n=5 as the sub-group size. The overtime usage in different sections may respond differently to centalisation/ decentralisation differently. I have this suggestion: Why not conduct a standard t-test testing for difference in the mean overtime usage in each of the 5 sections- under each system- you have 16 data points on each section-under the two alternative systems. You may in fact find that in some sections the overtime might have gone up and in others it might have come down. The same might have happened about the variability in usage. R.Rajagopalan raja@fac.irm.ernet.in ============================================================================[Next of thread] [Author List] [First of thread] [First by author]
Fri, 12 Jul 1996 07:49:10 -0400
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I am considering writing a paper or article on the relationship between
chaos and randomness, the thesis of which would be something like "chaos" is
to "randomness" as a histogram is to a distribution curve, as the real world
is to the mathematical plane. The abundance of literature is huge, though, so
I may be just repeating someone else's work. Does anyone know of a paper or
article which already does this?
I have read Dr. Shewhart and some of Dr. Deming's thoughts on the nature
of randomness. I have read several books on chaos, and some papers by Wheeler
and others which touch on the relationship between the two, but I haven't had
a chance to read (and might not understand if I did read) any of Fiegenbaum,
et al--the original technical papers on Chaos Theory.
So, anyway, I'll defer to those on the net whose experience and wisdom
are so much greater than mine--is this an article which would be useful, or
should I concentrate my efforts elsewhere?
Your thoughts would be greatly appreciated.
Rip Stauffer
Naval Leader Training Unit
Ripstaur@aol.com
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Fri, 12 Jul 1996 07:49:12 -0400
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I'm not sure I understand your subgroups. You have 5 treatment centers;
are you taking one data point from each treatment center and averaging across
them? If that is what you are doing, one thing you want to check for is lack
of stratification. If a lot of your data (one rule of thumb Wheeler uses--I
think he got it from Nelson--is 15 consecutive points) is within one sigma of
the centerline (especially on the range chart), it is an indication that you
may be assuming a parallel process where there is none. In this case, you
usually want to reconsider your subgrouping scheme.
This technique is counterintuitive and most of my students have a hard
time seeing the value in it. They see a chart with lots of data right near
the centerline and well within the control limits and "think" they see an
indication of a very stable system. The "specification limit" mentality is so
engrained they can't see what could be wrong with a process "so far inside
the limits." That paradigm has to shift before they can understand that the
empirical rule cuts both ways--if 60 to 75 percent of the data should be
within one sigma, then 95 percent should NOT be.
Wheeler and Chambers, in chapter six of Understanding Statistical
Process Control, have an excellent discussion of rational subgrouping. It
shows the same data from the same process organized three different ways. The
new insights available from the different subgroupings are eye-opening.
Regarding the other rules, I like the idea of using Wheeler's rules
1-4, the Western Electric zone tests. The more rules you add, the shorter
your Average Run Length (ARL) between false signals will be; but the ARL
drops dramatically as you add rules after Rule 4. In a recent seminar, Don
said to use rule 1 first, of course, rule 4 (8 consecutive on one side of the
centerline) second, then use the other two. It depends on what's economical
for you.
Hope this helps.
Rip Stauffer
Naval Leader Training Unit
Ripstaur@aol.com
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Fri, 12 Jul 1996 12:26:52 -0500
[Next of thread] [Next by author] [First of thread] [First by author]Skew Distributions: That is the problem with the chart you are using. It is full of holes. Use an X-bar R chart with n=4 and be careful that you select rational subgroups. Pareto Diagram: The pareto diagram analyses the common causes of a stable process to see which cause occurs the most over time. This is not ranking and rating as Deming referred to. Those few causes that occur most often can be further analysed seperately in terms of control charts, or whatever makes sense in order to reduce them. Note that the purpose here is to improve the system. Improving the system takes more profound knowledge than mere tools Alternative tools for problem solving: What I do't like about the cause and effect diagram, (fishbone diagram) is that it is linear. Most problems are not linear. Any tool that works can be used. Kepner Tregoe is great for going after special causes, which is what it was designed for. I invent most of the tools I use, on the job, as I face the problem with my clients. Tools come from theory. It is the theory that counts. Regards, Heero Hacquebord Consultant in Continual Improvement heeroh@mailbag.com =========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 12 Jul 1996 12:00:55 -0500
[Next of thread] [Next by author] [First of thread] [First by author]I have not got the time to study in detail all the responses about control charts, but let me say this to try and help! The limits that Dr. Deming uses for his red beads are the same as what is shown in most text books. Use them and you will not go wrong . In fact, in 1980, Dr. Deming was using the limits as applied to a poisson distribution. I pointed this out to him and suggested he use the one's he had currently been using. He has used these limits since 1980 ever since I pointed this out to him. He gave me recognition for those limits based on the binomial distribution in his seminars, at least once that I was there. The attributes data that applies to the binomial distribution has to be used on a p-chart. If you have attributes data as you describe, but it does not meet the binomial distribution, then there are special causes, or you have some other kind of a distribution, but not a normal distribution. This is precisely what the p-chart does for attributes data, to see whether we have a stable process, which means a binomial distribution. Without a binomial distribution for attributes data you can not predict, which is the overall purpose. If you use variables data charts for attribute data you could get false signals. Consider a p-chart. The limits are not influenced by the point to point variation, but by the mean. Consider an X-MR chart. The limits depend on point to point variation. Every special cause will be included in the calculation of the limits, except special causes due to trends. DO the following experiment: Find a process for attributes data that signals several special causes on a p-chart, i.e. points outside the control limits. Use now an X- MR chart for this same data. You will probably find no special causes, Why? Therefore, if you had a process for attribute data that has special causes you will find these special causes on a p-chart, but often will miss them on a chart for variables data. This is why Shewhart spoke about a "Rational subgroup". The question is not how the binomial or other distribution approximates a normal distribution, but what do you see when there are special causes. Parametric statistical theory assumes a distribution. This is often not the world that we are in. The purpose of the control chart is to see whether the process is stable, which implies a distribution close enough to the known ones. The question is not what distribution is approximated by a stable process, but whether there is a better one than what we know? If a p-chart shows special causes we do not have a (binomial) distribution, and therefore we cannot predict. If an X bar R chart, or an X -MR chart shows special causes we do not have a (normal) distribution and therefore have no prediction. If a c-chart shows special causes we do not have a (poisson) distribution and therefore cannot predict. Don't mix different charts with different types of data or you will get false signals, and crazy control limits, and don't mix different distributions with one another just because statisticians say that they approximate one another, (under certain conditions). Now it is true that IF a process is stable (but how would we know) you can mix different charts and get similar answers. But that is not the pupose of the chart. The purpose of the chart is to see WHETHER the process is stable, and for this we should not mix the different charts, and different distributions. For attributes data use a p-chart or np chart (same thing, because p = np/n). For count data, (rare events, where you can count occurrences but can not count non-occurrences, e.g. accidents, # of lighting strikes etc,) use c-charts or u-charts (same thing because u=c/n). For variables data use X-bar R charts, or X- MR charts if you have few data. Where possible use variables data, i.e. gauges that give readings instead of go-no-go gauges, because with variables data we do not require large sub groups). There are other charts for other distributions, such as exponential, but the charts mentioned for the data as applied will work for 99% of all cases. Heero Hacquebord Consultant in Continual Improvement heeroh@mailbag.com ===========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 12 Jul 1996 12:00:23 -0700
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>I am considering writing a paper or article on the relationship between
>chaos and randomness, the thesis of which would be something like "chaos" is
>>> snip <<<
>Your thoughts would be greatly appreciated.
>Rip Stauffer
>Naval Leader Training Unit
>Ripstaur@aol.com
Here are my ideas on appropriate definitions:
CHAOS = Future events CANNOT be predicted whatsoever on the basis of
past events. There are no coherent patterns nor controls. In Statistical
Process Control parlance, the process is "out of control".
RANDOMNESS = I do not know exactly what the next event will be, but I
can make a prediction based upon past events. For example, I know that past
data fits a normal distribution with an average of 10 and a standard deviation
of 2. Therefore, I can make predications about future events, and (by making
use of the Central Limit Theorm) can be accurate over a large population.
An assumption is that we are talking about a stable ("in control") random
process. Further interesting points to discuss would be INDEPENDENCE from event
to event vs. some DEPENDENCE between events.
- Steve Prevette
steven_s_prevette@rl.gov
Westinghouse-Hanford Corp.
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>1. Skewed distributions and the Empirical Rule
What I am currently doing in my job in similar situations is invoking the
7 points in a row below average, or 4 of 5 in a row below one standard
deviation below average (if the average minus 1 standard deviation is >
0), and 2 of 3 in a row below 2 standard deviations below average (again,
if average minus 2 standard deviations is greater than 0) rules for
detecting significant change. So three zeroes in a row would only be
significant if the average minus two standard deviations is greater than
zero.
I know this causes some inaccuracies. If this is a real fear, you could
always invoke a more sophisticated run theory (average run length)
approach. Or even change your time interval to longer so more sales
occur per time interval and the lcl will be greater than 0. But over the
past 3 years I have found the simpler approach (above) to be sufficient
in the long run.
>2. Pareto charts and population distributions
I would say (based upon how I have been doing this) is the difference
in approach is the time interval over which you do a Pareto. Say that
I just had seven months in a row above average and declared a
significant increase occurred. I might do a Pareto over those seven
months to learn what special cause has occurred.
However, if the process has been "in control" over a long period of
time, I want to try to get some ideas how to improve (ie change the
process), I might do a Pareto breakdown over the life of the process
(hopefully at least 25 time intervals). This is less likely to be
worthwhile, but I am having good use of it. For example (this is
real), our accident case rates are "in control" and stable. The
company wants to figure out how to improve. I routinely do long time
interval Pareto charts (over years of accidents) showing the most
common causes (in our case, Overexertion: Lifting, Pushing, Pulling).
Now I know I can tell management - "If you want to reduce accident
rates, we need to change the process by which with lift objects".
>3. Alternative tools for problem solving
I like flow charting out the process, myself.
Steve Prevette
steven_s_prevette@rl.gov
Westinghouse Hanford - performance measures
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Fri, 12 Jul 1996 17:23:19 -0400
[Topic List] [Next by author] [First of thread] [First by author]In a message dated 96-07-12 01:26:05 EDT, Lamb writes: << 2. Pareto charts and population distributions It is common practice to use Pareto charts to stratify data to determine an area in which intervention may be beneficial where variation is all common cause. There is no mention of doing a control chart to see whether the Pareto item is a special cause relative to the underlying process. On the other hand, Deming advises us not to take action [on people] based on a ranking within a common cause distribution. What is the fundamental difference between the two scenarios? >> In exploring this relationship, I have taken data from a Pareto (Juran) chart and run a control chart (IndX/moving R). I always rearrange data into "random" order (either by drawing lots or by alphabetizing). Invariably, I have found that the "significant few" fall outside limits. However, two things have struck me. First, what is the operational definition for a Pareto/Juran distribution. Could in fact, a control chart provide the means? However, n.b., that the Significant Few plus the trivial many, often are not large enough to use a C.C. without trepidation. Second, does it matter whether or not there is an operation definition for a Pareto/Juran distribution? Implicit behind Juran's developement of Pareto method (as I recall) is the underlying assumption that one needs to do something to begin cycle of improvement. Second, it provides a method to get the biggest bang for the quality buck. Even if the line of defects or causes in a Pareto chart produce no actual significant few (out of control) and trivial many, what they then do represent is a system in control (e.g. consistantly turning out crappy stuff). Improvement of this system is the responsible of management. But by what method does management decide to attempt to act. The PSDA gives us a general process but it can not make the decision for management on what to begin. I suggest that in this sense the Pareto Chart is less a stastical process tool than a management decision-making instrument. John D. Kromkowski Attorney at Law The Jefferson Building -- Suite 103 105 W. Chesapeake Ave. Towson, MD 21204 Tel. 410-821-6116 Fax 410-828-0705 kromkowski@aol.com =========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Fri, 12 Jul 1996 17:21:31 -0400
[Topic List] [Next by author] [First of thread] [First by author]Re: discussion of Intrinsic. Wouldn't Deci shed some light? ===========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Fri, 12 Jul 1996 17:23:29 -0400
[Next of thread] [Next by author] [First of thread] [First by author]In a message dated 96-07-12 12:27:49 EDT, Stauffer writes: << I am considering writing a paper or article on the relationship between chaos and randomness, the thesis of which would be something like "chaos" is to "randomness" as a histogram is to a distribution curve, as the real world is to the mathematical plane. The abundance of literature is huge, though, so I may be just repeating someone else's work. >> I'd comment that "chaos" is a pretty loaded term with lots of different meanings. For example, it might be used to describe "almost-periodic" data; to describe data that ostensibly meets "tests" of randomness but actual contains some underlying order, which may be described by non-linear equations; to describe a dynamic systems producing ordered (i.e., with order or predictability) outcomes (e.g., outcomes in statiscal control) which however may when perturbed even slightly (i.e. by that which ostensibly is insignificant) may produce unordered (i.e., not predictable) outcomes. (Or visa versa. Or where slight perterbations may alter system from one state of control into another.); or to describe data that is self-similar across scales (fractalness). "Random" also has definitions associated with it coming from a bit longer tradition of mathematicians and statisticians. Hence, it light of your paper: do you intend to decide first what you mean by randomness and chaos and _then_ explain and test your thesis? Or do you plan to shape the definition of randomness and chaos to fit your thesis, regardless of the tradition and history (longer for random, shorter and less-well defined for chaos)? I am also not sure that the mathematicians involved in the study of "chaotic" systems would suggest that randomness is just some ideal contraposed to chaos. Of course, I am not one of those mathematicians and I am certainly not wise. However, it was my understanding that these fellows are perfectly willing to say that some sets of data are chaotic and some are random and some are ordered (neither chaotic nor random, but satisfying some linear equation) and some are of a kind that it cannot be determined whether or not they are random or chaotic. Good luck on your enterprise. J. D. Kromkowski ===========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 12 Jul 1996 19:10:14 -0400 (EDT)
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> I am considering writing a paper or article on the relationship between
>>> snip <<<
> Your thoughts would be greatly appreciated.
>
>Rip Stauffer
>Naval Leader Training Unit
>Ripstaur@aol.com
>
Mathimatica, which studies fluid dynamics and other things I do not understand
may point out that just because something is beyond our range of knowledge
at the present it may not be random or chaotic. Try a search engine.
Wisdom?
Thanks,
John
jkaliste@skipjack.bluecrab.org
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Sat, 13 Jul 1996 03:12:35 -0400 (EDT)
[Topic List] [Next by author] [First of thread] [First by author]--Boundary (ID hgXYYFEIskvXkNl+MDuMwA) Content-type: TEXT/PLAIN; CHARSET=US-ASCII Tom & Del, RE: attached note from Bill Ratcliff. Either of you remember where the Deming GIF came from? CyberQ-Guy out. --Boundary (ID hgXYYFEIskvXkNl+MDuMwA) Content-type: MESSAGE/RFC822 Date: Thu, 11 Jul 1996 12:34:48 EDT From: Bill Ratcliff[Topic List] [Next by author] [First of thread] [First by author]Subject: Photo of Dr. D. To: Jim Clauson Message-id: <31E52D28.1C4C@radix.net> MIME-version: 1.0 Content-type: TEXT/PLAIN; CHARSET=US-ASCII Delivery-date: Thu, 11 Jul 1996 09:33:00 EDT Posting-date: Thu, 11 Jul 1996 08:33:41 EDT Importance: normal A1-type: MAIL Jim Do you know the origin of the photo that is the downloadable file on DEN? Variuos people have been looking for photos which have owners who will give formal permission to use in publicatios. I see the Web page is up and looking good. Regards Bill --Boundary (ID hgXYYFEIskvXkNl+MDuMwA)--
Tue, 16 Jul 96 00:09:17 EDT
[Topic List] [Next by author] [First of thread] [First by author]Don Wheeler has written a nice little paper on the relation between chaos and probability. The concept of randomness is treated in my book, "Rational Descriptions, Decisions and Designs" (Pergamon, 1969). The treatment is not necessarily consistent with what you will read elsewhere, but is consistent with Don wheeler's views, as far as I know. My working definition of randomness is: A table of numbers is RANDOM if, knowing the first N entries in the table, there is no way to predict the value of the (N+1) entry. A number taken from such a table is called a RANDOM NUMBER. Generally a table of random numbers is generated to be uniformly distributed in a specified interval, say 0 to 1. Then, after the person generating the table is convinced (??) that the distribution is uniform, a transformation may be applied to make the distribution "normal" or some other distribution. Numbers generated via chaos theory do not fit this definition. However, if you do not know the source of the numbers, you might well conclude that the numbers are random. Your thesis sounds like a lot of fun. Enjoy it. Good luck. Myron Tribus ========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Mon, 15 Jul 96 13:22:35 EDT
[Next of thread] [Next by author] [First of thread] [First by author]This note is written from Jerusalem where I am in the middle of a two week exposure to the teachings of Dr. Reuven Feuerstein. His theory of cognitive modifiability, that is, that the cognitive structures of human beings can be modified, regardless of their condition, has strong implications for the quality movement. He has made applications to children with Down Syndrome, to the aged, to people who have had brain damage and in all these cases his successes have attracted world wide attention. There are some, who like myself, who ask, "If these methods work with those who have learning disabilities, how will they work with the so-called 'normal' people." The results here, too, have been impressive and that is why I came. For most of us, not trained in psychology, the language is a barrier. In this progress report I shall do my best to translate and I apologize in advance to those who know much more than I do and do not require any translation. Indeed, they may wish to rush forward to correct my imprecision and for that I shall be grateful. To cause someone to change their cognitive structure means to change their paradigm -- to change the way they understand the world and their place in it. It means to change the way they think and, in particular, how they approach the task of adapting to new situations. Cognitive structures govern the way we approach problem solving. I am learning that there are many things in Feuerstein's theories which are the same as Deming's approaches. One aspect is beautifully illustrated in the book by Feuerstein, Rand and Rynders, Plenum Press, 1988, ISBN 0-306-42964-0, "Don't Accept Me as I Am: Helping 'Retarded' People to Excel". In this book the authors describe their successes with children and adults with severe handicaps, such as Down syndrome, brain damage caused by accidents, etc. The book does not discuss the successes which are now being achieved in improving the performance of so-called 'normal' children, the issue which brought me to Israel to study in the first place, but for those interested in education in general, there will be many hints on what to do and what not to do even with adults and so-called 'normal' students. The book discusses the belief system required for success and I was struck by how much it applies to quality management. Here are the statements lifted from the first chapter of the book. Each statement requires a few paragraphs of explanation, but those familiar with quality management will quickly fill in the missing material. In parenthesis I put the equivalent statement for quality) Belief #1: Human Beings are Modifiable (Organizations can be changed) If a manager does not believe this, then the next step will be to marshall the information on which he or she may change their mind. Belief #2: The Individual I am Educating is Modifiable (My organization, this one, can be changed.) If your client says, "Oh yes, but those organizations were different" you have to show him or her that they were equally difficult at first. This is where networking with other CEO's is important. It is a kind of benchmarking not normally recognized. Belief #3: I am capable of modifying the individual (I, the manager, can, or will acquire the ability to, change my organization) If the client thinks of himself as uneducable, then you really have a problem. This may require you to ask a number of searching questions to uncover why. In fact, such a client is a ripe candidate for Feuerstein's method of Mediated Learning. More on that in another report. Belief #4: I, Myself, am a Person Who May - And Has To- Be Modified. (If I undertake to change my organization, I, too, will be modified. That is a good outcome, for I probably need it.) This is a delicate issue to raise. It is essential that the manager accept that he will have to change. Later we can discuss how to bring about changes in managers. What is required is the belief that changes in the person will come and they will be beneficial. Belief #5: Society - And Public Opinion - Are Modifiable and Have to Be Modified. (The enterprises with which I do business and the business community can be and have to be changed to make quality the way we do busin ess.) The real leaders in our enterprises, such as Ford, Xerox, Procter and Gamble have, in fact, formed a consortium and put up real money ($9 million to be precise) just to change the scene. You can refer to this action as evidence that others believe so. Managers who do not believe these things, will not succeed, for they will not attempt the required changes. However, you should not accept them the way they are, but you should try to modify them. Read the Feuerstein book to see how. This set of beliefs, usually not articulated clearly, is why meetings about quality seem to take on a religious tone. Alas, this is also why quality meetings often generate zealots. I commend this book to anyone wanting to get a start on understanding human development. When I learn more, I shall write more. MYRON TRIBUS =====================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Sun, 14 Jul 1996 10:39:54 -0500 (EST)
[Topic List] [Author List] [First of thread] [First by author]Thanks. Before I leave, there is one question that I would like to pose: as new technology is having a tremendous impact on the various ways education and educational concepts are delivered to today's students, how can the principles of Deming be applied to strengthen academic of success to insure a quality program of deliverance? Thanks, for the support, the information, and the guidance through the Deming principles of quality application. I am learning a great deal more than I ever thought that I am ready to learn. Again...Thanks! Raymond Butler EMAIL: rbutler@indiana.edu --------------------------------------------------------------------------- URL: http://copper.ucs.indiana.edu/~rbutler =======================================================================[Topic List] [Author List] [First of thread] [First by author]
Tue, 16 Jul 96 23:16:30 EDT
[Next of thread] [Next by author] [First of thread] [First by author]I have some difficulty with Myron's definition of randomness: >My working definition of randomness is: A table of numbers is RANDOM if, >knowing the first N entries in the table, there is no way to predict the value >of the (N+1) entry. A number taken from such a table is called a RANDOM NUMBER. According to this definition, numbers generated by any pseudo random number generator, as used in all computer random number generators, would not satisfy the definition. Many (not all for sure) of these are well regarded with respect to their behavior. Also, a highly autocorrelated time series would meet the definition of random proposed here, but would not possess the properties of independence one would typically like to be exhibited. We never know in practice whether the process that lies behind the generation of a series of numbers is random. Randomness is a concept. We may agree to criteria which may be applied in practice to make a judgment, and we may assess the results of repeated application of such criteria in use. In doing so we provide operational meaning to the use of the term [random]. Dr. Deming used to say that a table of random numbers becomes useful when we know what is wrong with it. The criteria which we agree to use for judgment of whether or not the concept of randomness is applicable in a given instance do in fact have their basis in the mathematical theory containing the concept of randomness. This does not, however, mean that such theory is subsequently assumed in the application of the agreed upon criteria. The criteria are what provide operational meaning to the concept, once agreed upon. Judgment of the appropriateness or usefulness of the criteria will subsequently not be relative to the theory from which they were derived, but their effectiveness in use. This brings me to a point of disagreement with some of the control chart discussions that have been occuring recently. How can it be argued that, on the one hand, the Normal distribution is not a required assumption for use of X-bar and R charts or I and MR charts but, on the other, that the Binomial distribution is a necessary assumption behind use of p or np charts (or equivalently Poisson behind c or u charts). I believe this is clearly logically inconsistent. It would appear that I am in disagreement with Don Wheeler on this point, so I'd better put forward my argument: The Normal distribution was used by Shewhart in his derivation of formulae to compute control limits for X-bar and R charts. One does not need to assume that data are Normally distributed in order to use X-bar and R charts. If one needed to make such an assumption one would already have made the judgment, prior to use of the chart, that a particularly restricted form of state of statistical control exists. Since one of the uses intended by Shewhart for the control chart was that of judgment of whether a state of statistical control exists, it clearly does not depend upon the assumption of statistical control! This is the sense in which the control chart provides an operational definition for the concept of statistical control, and thus puts communicable meaning into the concept. Judgment of the usefulness of the control chart is not relative to Normal theory, but rather to whether or not the control chart is found in use to provide signals that are a reliable basis of learning for improvement. In the same vein, the Binomial distribution provided a basis for deriving the control limits for p and np charts. That does not mean that one needs to meet the conditions that provide the basis for the Biinomial distibution in order that one may use a p or np chart. One should ensure that the measurements are of agreed upon form - groupings of events which may be classified in one of two consistent ways. Beyond this however, the p or np chart may be considered as an operational definition of whether or not a state of statistical control exists in the process which generates such data. Let the control chart provide signals of causes which might be manifested as non-constant p, lack of independence and so on. I would like to illustrate this through the following example in which I was involved. Some data had been collected by a casting facility on the % of their transmission cases that were being rejected by their customer on a daily basis. The data were plotted on a p-chart which showed a lot of out of control signals - the control limits were probably only capturing about 25% of the overall process variation. Rather than immediately concluding that this was a problem with the choice of control chart, the potential causes were investigated through thinking about how one might see far more variation in results than would be expected for Binomial type data. When the inspection method was investigated at the transmission plant, it was found that it was a sample-lot inspection scheme. The top 4 transmission cases were being inspected in each batch, and if 1 or more defective case was found, the whole batch was rejected. This introduces an additional source of variation into the data beyond what one would have observed had the data been generated from inspecting every casting. One could look at it as introducing a lack of independence within each batch between the results of inspecting the first 4 cases and the results for the remainder of the batch. It seems to me that the Binomial assumption would not have been justified. This judgment is based on knowledge gained through investigating the potential causes of the signals on the chart, so in this case I would have been faced with the perplexing problem of needing to have knowledge for use of a method without whose use I would not [necessarily] generated the necessary knowledge. The next question was what next? One option would have been to revise the method of inspection or the method of recording results to remove the cause of variation identified. A p-chart might then be used to test the theory that this was the cause, and provide a basis for further learning for improvement. If the method of inspection were to remain, an alternative here would be to consider use of an individuals and moving range chart. The reason for such consideration is the deliberate intent to incorporate the identified cause of variation into the calculation of control limits. This is a rational basis for changing the type of control chart used. Whether or not it turns out to be useful will depend on whether or not one is able to use it to learn and improve. It would appear to me that changing the control chart one uses on such a basis is a very different thing to changing based upon getting "too many" or "too few" signals alone. I shall be very interested to see what you all think of such thinking. Cheers, Ian Bradbury LNUSPTH1.RZYJ8C@GMEDS.COM ===========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 17 Jul 1996 08:36:55 -0400
[Next of thread] [Author List] [First of thread] [First by author]At 11:16 PM 7/16/96 EDT, you wrote: >I have some difficulty with Myron's definition of randomness: > >>My working definition of randomness is: A table of numbers is RANDOM if, >>knowing the first N entries in the table, there is no way to predict the value >>of the (N+1) entry. A number taken from such a table is called a RANDOM >NUMBER. > >According to this definition, numbers generated by any pseudo random number >generator, as used in all >computer random number generators, would not satisfy the definition. Many (not >all for sure) of these are well >regarded with respect to their behavior. > If we add the words "without knowledge of the mathematical rule governing the table" at the end of the first sentence, then we have a definition of randomness that should satisfy you and Myron. Pseudo-random number generators have the appearance of randomness because they use a rule that we generally don't know, and generate numbers that appear statistically random. >Also, a highly autocorrelated time series would meet the definition of random >proposed here, but would >not possess the properties of independence one would typically like to be >exhibited. > Random does not necessarily imply independence. The rule that governs the sequence may include autocorrelation. That's how we could use a random number generator to simulate an autocorrelated time series. Important point here: randomness is not completely without pattern; randomness is a pattern that obeys statistical and mathematical rules, but the next number in the sequence cannot be predicted _with_certainty_ without knowing in detail the rule that governs the sequence. >We never know in practice whether the process that lies behind the generation >of a series of numbers is >random. Randomness is a concept. We may agree to criteria which may be applied >in practice to make >a judgment, and we may assess the results of repeated application of such >criteria in use. In doing so we >provide operational meaning to the use of the term [random]. Dr. Deming used to >say that a table of >random numbers becomes useful when we know what is wrong with it. > >The criteria which we agree to use for judgment of whether or not the concept >of randomness is applicable >in a given instance do in fact have their basis in the mathematical theory >containing the concept of >randomness. This does not, however, mean that such theory is subsequently >assumed in the application >of the agreed upon criteria. The criteria are what provide operational meaning >to the concept, once agreed >upon. Judgment of the appropriateness or usefulness of the criteria will >subsequently not be relative to >the theory from which they were derived, but their effectiveness in use. > You have to have both. If you divorce the theory from which they were derived (the "mathematical rule") from the effectiveness of use, you have no basis for objective judgment; effectiveness becomes a matter of opinion. Understanding the pattern of randomness (its probability distribution, other mathematical rules that govern it) helps us analyze its effect. >This brings me to a point of disagreement with some of the control chart >discussions that have been >occuring recently. How can it be argued that, on the one hand, the Normal >distribution is not a required >assumption for use of X-bar and R charts or I and MR charts but, on the other, >that the Binomial >distribution is a necessary assumption behind use of p or np charts (or >equivalently Poisson behind >c or u charts). I believe this is clearly logically inconsistent. It would X-bar and R charts take advantage of the central limit theorem. In effect, the individual data points are not required to be normal because we use them in subgroups in a way that allows us to use the normal distribution to compute limits. I and MR charts are much more sensitive to the distribution of the data; if it departs substantially from normal, I and MR charts may give surprising results leading to erroneous conclusions. This is because the central limit theorem does not apply, since we are not subgrouping. >appear that I am in disagreement >with Don Wheeler on this point, so I'd better put forward my argument: > >The Normal distribution was used by Shewhart in his derivation of formulae to >compute control limits >for X-bar and R charts. One does not need to assume that data are Normally >distributed in order to use >X-bar and R charts. If one needed to make such an assumption one would already >have made the >judgment, prior to use of the chart, that a particularly restricted form of >state of statistical control exists. >Since one of the uses intended by Shewhart for the control chart was that of >judgment of whether a >state of statistical control exists, it clearly does not depend upon the >assumption of statistical control! >This is the sense in which the control chart provides an operational definition >for the concept of >statistical control, and thus puts communicable meaning into the concept. >Judgment of the usefulness >of the control chart is not relative to Normal theory, but rather to whether or >not the control chart is found >in use to provide signals that are a reliable basis of learning for improvement. > Without correct use of the theory governing the control limits and their associated probabilities, how can you judge effectiveness? There are probably ways, based on long-term observation of the process, but they are not as efficient as control charts, nor are they as reliable. >In the same vein, the Binomial distribution provided a basis for deriving the >control limits for p and np >charts. That does not mean that one needs to meet the conditions that provide >the basis for the Biinomial >distibution in order that one may use a p or np chart. One should ensure that >the measurements are >of agreed upon form - groupings of events which may be classified in one of two >consistent ways. >Beyond this however, the p or np chart may be considered as an operational >definition of whether or >not a state of statistical control exists in the process which generates such >data. Let the control chart >provide signals of causes which might be manifested as non-constant p, lack of >independence >and so on. > >I would like to illustrate this through the following example in which I was >involved. Some data had >been collected by a casting facility on the % of their transmission cases that >were being rejected >by their customer on a daily basis. The data were plotted on a p-chart which >showed a lot of out of >control signals - the control limits were probably only capturing about 25% of >the overall process >variation. Rather than immediately concluding that this was a problem with the >choice of control >chart, the potential causes were investigated through thinking about how one >might see far more >variation in results than would be expected for Binomial type data. When the >inspection method >was investigated at the transmission plant, it was found that it was a >sample-lot inspection scheme. >The top 4 transmission cases were being inspected in each batch, and if 1 or >more defective >case was found, the whole batch was rejected. This introduces an additional >source of variation >into the data beyond what one would have observed had the data been generated >from inspecting >every casting. One could look at it as introducing a lack of independence >within each batch between >the results of inspecting the first 4 cases and the results for the remainder >of the batch. It seems to me >that the Binomial assumption would not have been justified. This judgment is >based on knowledge >gained through investigating the potential causes of the signals on the chart, >so in this case I would >have been faced with the perplexing problem of needing to have knowledge for >use of a method >without whose use I would not [necessarily] generated the necessary knowledge. > The values of p from lot to log can vary widely. Major point is that you have a p value that is affected by the inspection process. You are right, in that you need the knowledge of how the inspection is done. However, the binomial assumption is still justified. An interesting exercise would be to compute the value of p for accepted lots and p for the overall process. You don't say whether rejected lots are screened and defectives replaced. This would further complicate the process, and lead to large differences in p from lot to lot. Should you have knowledge of the process that feeds your control chart? Definitely yes. Control chart decisions are not made in a statistical vacuum, they are made with process knowledge, aided by statistics. But this process is still binomial, as you describe it. >The next question was what next? One option would have been to revise the >method of inspection >or the method of recording results to remove the cause of variation identified. >A p-chart might then >be used to test the theory that this was the cause, and provide a basis for >further learning for >improvement. If the method of inspection were to remain, an alternative here >would be to consider >use of an individuals and moving range chart. The reason for such consideration >is the deliberate >intent to incorporate the identified cause of variation into the calculation of >control limits. This is a >rational basis for changing the type of control chart used. Whether or not it >turns out to be useful >will depend on whether or not one is able to use it to learn and improve. It >would appear to me that >changing the control chart one uses on such a basis is a very different thing >to changing based >upon getting "too many" or "too few" signals alone. > Changing control charts to find the one most appropriate for both learning and correctly matching the underlying process is important, and right, it should not be done simply because of the number of signals. Be careful, though, of replacing a p or c with I and MR. You will then have the problems associated with departure from normality to worry about. Shewhart came up with workable rules based on 3-sigma limits, based on normal theory, that led to predictable errors. When we throw out the theory, we lose the predictability. >I shall be very interested to see what you all think of such thinking. > >Cheers, Ian Bradbury >LNUSPTH1.RZYJ8C@GMEDS.COM > D. L. Kimbler, Ph.D., P.E. Chair, Dept of Industrial Engineering Clemson University kimbler@ces.clemson.edu ===========================================================================[Next of thread] [Author List] [First of thread] [First by author]
Wed, 17 Jul 1996 13:19:39 -0400
[Next of thread] [Next by author] [First of thread] [First by author]In the control charting question Dr. Tolman presented, there was discussion about collecting data from five different sources (one point for each source) on a single control chart. I would think carefully about this approach. A key purpose of a control chart is to reduce differences among the products a process produces. Reducing unnecessary differences helps us. Reducing necessary differences may hurt. Before we use a single control chart on what may or may not be different processes, we need to ask whether it makes management sense to treat the processes as if they were the same. To answer this question, I might suggest questions like: Do the five centers serve the same types of clients? Do they perform the same kinds of therapeutic activities? Do they have the same treatment goals? Are they trying to accomplish the same results? Not being a psychologist, I really don't know exactly what questions to ask, but the basic thrust is to ask if the five different areas really should be treated as the same for management purposes, and if it makes sense to expect them to behave the same way, given the organization's overall goals. If the five sources serve different purposes, I would suggest different control charts on each at least to start, understanding that this will require more time and patience. The reason is that if the areas serve different purposes, differences among them may be useful, even necessary, to the organization's well-being. We may find later on that we want to increase the differences to better each area's contribution to the whole. We may find the opposite: differences in the charactistics we want to measure may be completely irrelevant to the five sources' differences in purpose and function and be nothing more than a nuisance. But the fact of the matter is, we don't know yet. By thinking of all five as one process from the start, we not only predecide the necessary inquiry, but, by acting on the chart and eliminating what may be legitimate and necessary differences between different processes as "special causes," we may be tampering with the system and making things worse. If the five all serve the same purpose and are functionally the same, and hence it makes management sense to want to try to make them as similar as possible, I would then go ahead and attempt a single control chart. Of course, the five may prove to be "out of control" when thought of as a single process, but by making the management decision that all parts should be regarded similarly, we will have legitimate reason to treat such a result as a problem to be solved, rather than as a potential source of organizational strength. The questions to ask in the inquiry are generally qualitative ones, not quantitative ones. It requires organizational and subject-matter expertise. A statisician can help here only by suggesting possible lines of inquiry. Jonathan Siegel jmsiegel.info.research@worldnet.att.net =======================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 17 Jul 1996 12:35:26 -0400
[Next of thread] [Next by author] [First of thread] [First by author]The reason why a X-R chart works well with nonnormal (but reasonably symmetric) distributions but a p-chart doesn't is that the X-R model is more robust (less sensitive) to deviations from normality than the p model is to deviations from the binomial. This is partly because the X-R chart is working with a mean (which tends to smooth out individual nonnormal observations and lessen the effect of outliers) while the the p-chart relies on individual observations and gives outliers their full effect. I remember Dr. Deming saying that there is no logical connection between the concept of randomness and the theory of probablity -- it just seems to happen to work out that way! Jonathan Siegel jmsiegel.info.research@worldnet.att.net ========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 17 Jul 1996 06:43:30 -0700
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From Ian Bradbury:
>The Normal distribution was used by Shewhart in his derivation of formulae to
>compute control limits
>for X-bar and R charts. One does not need to assume that data are Normally
>distributed in order to use
>X-bar and R charts.
In the performance measurement work I have been doing, I would agree
with Ian's writeup. I find it worthwhile to think of a control chart
as a test of the hypothesis that the process is creating stable,
random data that is predictable and "in control". A failure of the
control chart (points out of control, detectable trends) rejects the
hypothesis that the process is "in control".
One concept worth discussing is "robustness". Several statistical
tools (not only xbar-R control charts, but also Analysis of Variance
and Linear Regression) were based upon an assumption of Normal
distribution. However, many of these tools are "robust" in that they
also work well for non-Normal data distributions.
A specific case where I have found a c-chart worth while is in
graphing the number of "occurrence reports" at Hanford. There is a
specific criteria by which a formal occurrence report must be
submitted following an incident or accident. Originally, I graphed
these using x-charts. However, I kept noticing that the calculated
standard deviations were very close to the square root of the average,
suggesting empirically that a c-chart might be appropriate. I now use
c-charts to plot the number of occurrence reports per time interval.
It (in retrospect) makes sense that occurrence reports could follow
the independent, random arrival process (Poisson).
The discovery that the Poisson and c-chart fits actually helps to
understand the occurrence reporting process and how to work to
decrease the number of accidents and incidents. I now can tell if
tampering were to occur in the process of writing occurrence reports
(such as "if you write another occurrence report, you're fired").
Thankfully, no such tampering is evident in the c-chart data.
- Steve Prevette
steven_s_prevette@rl.gov
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Wed, 17 Jul 1996 15:52:35 -0400
[Next of thread] [Next by author] [First of thread] [First by author]We (Jim McKinley, Carole and I) are starting a new public offering (free) thru the chamber on SoPK. We know that there is a very heavy 7 habits influence among many who may attend so we have elected to begin with a focus on variation by using the Deming library tapes with a facilitated discussion afterwards. Does anyone have any constructive comments on the approach? Does anyone have a simple icebreaker for this first meeting? ptlstan ============================================================================[Next of thread] [Next by author] [First of thread] [First by author]
17 Jul 96 14:22:16 EDT
[Next of thread] [Next by author] [First of thread] [First by author]Points well taken. I was briefer in my remarks than I should have been. I cannot cite the source now (here in Jerusalem) so I am relying on memory. Once upon a time a set of random numbers was generated in the following way. A spinning disk was used with numbers from 00 to 99 marked on its circumference. This disk was photographed through the use of strobe light. The strobe light was triggered by the passage of a cosmic ray through an ionization chamber. Since cosmic rays arrive in a random way, so it is presumed, so ought to be the numbers thus generated. The professor in whose laboratories the apparatus was located went on a vacation and his assistant produced another set of random numbers. On inspection of the table of numbers thus produced it was decided that they were not random! Further investigation that the professor had actually censored the tables before they were released but the assistant had not. The reason for the censoring is that in a long list of numbers it is certain that there will occur some kind of recognizable sequence, i.e., a string of even numbers, a string of numbers in ascending or descending order, as sequence of prime numbers, etc. Indeed, it is not difficulty to imagine an unending sequence of numbers which might be generated by some scheme which sequence could be found. So, based on this story, it is not far fetched to speak of finding an error in a table of random numbers. All this is to say that Bradbury is right on the mark in his comments about randomness. CAn we get Don Wheeler to chime in? MYRON TRIBUS [Moderator's note: Don has not yet subbed to the DEN] =======================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 17 Jul 1996 23:00:18 -0500
[Next of thread] [Next by author] [First of thread] [First by author]Thank you Ian for your contribution. I agree with you. It is sometimes so difficult to understand that a distribution only exists when the process is in a state od statistical control, and therefore we need to use distributional theory as the basis, or operational definition, as to whether a state of statistical control exists. Using the normal model, i.e. X- MR chart for attribute data violates this basis, and will tend to hide special causes should they exist. There are so many books on SPC that teach the wrong things. Dr. Deming was concerned about this ten years ago, but had given up arguing with people. Heero Hacquebord heeroh@mailbag.com ========================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Fri, 19 Jul 1996 07:17:31 -0700
[Next of thread] [Next by author] [First of thread] [First by author]One of the basic assumptions in all types of control charts is the independence of each data point. If this were not true, randomness could not be assumed. The difficulty is that data independence does not happen in the real world. Particularly with attribute charts, with low p, defects will tend to occur in groups. The process will have a predisposition to defects when a special cause has arisen or is evolving. I'm sure most people have experienced how everything seems to go wrong at once. The closer points are together in time, the less independence there will be. This is a problem for subgroups in X bar R charts. Can anyone comment on how lack of independence of data is handled? Dr Tony Burns mmedia@ozemail.com.au ============================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Wed, 17 Jul 1996 17:04:04 +0000
[Topic List] [Author List] [First of thread] [First by author]On 5th July, Patrick Owings asks if Myers-Briggs may be used to select a vocation with intrinsic motivation. A data base exists showing the occupations actually chosen by different Myers-Briggs personality types. Career counsellors can use this to provide advice on careers empirically attractive to different personality types. This is covered in the manual "A Guide to the Development and Use of the Myers-Briggs Type Indicator", ISBN 0-89106-027-8. Regards, Peter Walker. ------------------------------- Walker Associates Tel:+44 1908 510593 Fax:511772 ==========================================================================[Topic List] [Author List] [First of thread] [First by author]
Thu, 18 Jul 96 09:36:39 EDT
[Topic List] [Next by author] [First of thread] [First by author]A point to consider about Dr. Tribus example. >A spinning disk was used with numbers from 00 to 99 marked on its circumference. >This disk was photographed through the use of strobe light. The strobe light >was triggered by the passage of a cosmic ray through an ionization chamber. >Since cosmic rays arrive in a random way, so it is presumed, so ought to be >the numbers thus generated. This mechanical method may not generate random numbers! If the rate of turning of the wheel is not uniform some numbers will spend longer under the strobe than others. The random input of light cannot correct for the unequal opportunity of selection. This will not yield equal coverage. This is much like the paddle that prefers one color of bead over another. A simple random sample should have EQUAL and COMPLETE coverage. Equal all possible outcomes have the same probability of occurrence. Complete all outcomes of interest are possible. Jack Jordan LNUSPTH1.WZ33XG@GMEDS.COM ======================================================================[Topic List] [Next by author] [First of thread] [First by author]
Thu, 18 Jul 1996 05:54:00 -0700
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Re: Randomness & Control Charts/Hacquebord
heeroh@mailbag.com (Heero Hacquebord)
Thu, 18 Jul 1996 12:02:49 -0500
[Next of thread] [Next by author] [First of thread] [First by author]Jonathan Siegel Wrote: >The reason why a X-R chart works well with nonnormal (but reasonably >symmetric) distributions but a p-chart doesn't is that the X-R model is >more robust (less sensitive) to deviations from normality than the p >model is to deviations from the binomial. This is partly because the X-R >chart is working with a mean (which tends to smooth out individual >nonnormal observations and lessen the effect of outliers) My Response: Yes, the distribution of averages of subgroups larger than four tend towards normality. This was one of the great contributions that Shewhart made. But note that here we are dealing with variables data. Jonathan Siegel wrote further: > while the the p-chart relies on individual observations and gives outliers their full effect. My Response: I disagree that the p-chart gives "outliers" their full effect. The limits for the p-chart depend on n and p-bar. They have nothing to do with "outliers", only in that "outliers" will affect p-bar. Which is less than what they would affect the control limits of an X-MR chart, for instance. Therefore an X-MR chart will gives "outliers" a fuller effect than a p-chart. So the p-chart is less sensitive to "outliers" than an X-MR chart. Therefore the danger in using charts for variables data instead of a p-chart, when we have attributes data. The p-chart does depend on normality, which is actually the binomial approximation of the normal distribution. Therefore when using a p-chart, np-bar must be greater than 5 for p-bar less than 0.5 or n(1-pbar) must be greater than 5 for p-bar greater or equal to 0.5. (The word "outliers" was used by Jonathan, and I am not sure whether this meant "special causes" My response implies that Jonathan's "outliers" are taken to mean "Special Causes") Thanks, Heero Hacquebord heeroh@mailbag.com ============================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Hypothesis testing and control charts/Hacquebord
heeroh@mailbag.com (Heero Hacquebord)
Thu, 18 Jul 1996 12:14:22 -0500
[Next of thread] [Author List] [First of thread] [First by author]> > From Ian Bradbury: > >>The Normal distribution was used by Shewhart in his derivation of formulae to >>compute control limits >>for X-bar and R charts. One does not need to assume that data are Normally >>distributed in order to use >>X-bar and R charts. > > In the performance measurement work I have been doing, I would agree > with Ian's writeup. I find it worthwhile to think of a control chart > as a test of the hypothesis that the process is creating stable, > random data that is predictable and "in control". A failure of the > control chart (points out of control, detectable trends) rejects the > hypothesis that the process is "in control". > > You would have had Dr. Deming doing flips if he heard anyone relate hypothesis tests to the control chart. The underlying theories and assumptions between these two are vastly different, as are the purposes. I agree with Dr. Deming's approach that we need to be precise in our language if we want to reduce misunderstanding. Regards, Heero Hacquebord heeroh@mailbag.com ======================================================================[Next of thread] [Author List] [First of thread] [First by author]
Re: Myron's Report on Fauerstein/Tolman
"Anton O. Tolman, Ph.D."
Thu, 18 Jul 1996 11:32:00 -0700 (MST)
[Topic List] [Next by author] [First of thread] [First by author]On Monday, July 15th, Myron sent his first report from Jerusalem. All I can say is, I bet you're having more fun than we are! :) I appreciate the information and thoughts, and especially the bridge between the language systems. The concept of paradigm changes is essential in achieving change in people and in systems. This refers partly back to my previous posts on the DEN about the effect of irrational thought patterns which tend to inhibit learning and growth or which actively produce withdrawal from new situations and information, or in many cases, produce symptoms of mental illness. I would bet that Fauerstein may use the term "schema" at times to describe some of these processes. This is also a very useful concept for understanding cognitive development and change in people. A schema is a complex brain organization/function which serves not only to process information in a specific way, but which actually affects the type of information we take in the first place through our senses. For example, a police officer may have a "break" schema which organizes the way he takes his morning breaks; perhaps it involves eating donuts in a 7-11 store, scanning the headlines of the papers, or chatting with the clerk. What information he attends to, how his behaviors are shaped, and what he thinks about are governed by his schema or set. However, if he gets a call to the 7-11 saying that it is being held up at gunpoint, he may go back to the same environment with a _different_ schema, say a "danger" schema activated. This schema will process information entirely differently -- both perceptually and cognitively. He will be scanning the environment differently -- for movement, gunshots, screams, escape routes, etc. and will NOT notice the information he usually processes when in that same environment. The description of how particular schemas are activated and deactivated at different times would seem essential for education and learning. I hope that some of what you will post, Myron, will help me understand this system better. I think I will have a look at Fauerstein's book as well. I look forward to your continued posts. ________________________________ Anton O. Tolman, Ph.D. Director, Psychological Services Director, Program Services Wyoming State Hospital P.O. Box 177 Evanston, WY 82931-0177 Anton@wsh.state.wy.us (307) 789-3464 --------------- ===========================================================================[Topic List] [Next by author] [First of thread] [First by author]
Wheeler & Control Charts/Stauffer
Ripstaur@aol.com
Thu, 18 Jul 1996 17:10:50 -0400
[Next of thread] [Next by author] [First of thread] [First by author]I have been reading all the comments on XmR vs. count charts with a lot of interest. A lot of appeals to theory have been made, some more convincing than others. Since I feel partially responsible for kicking off some of this controversy (and some of the responses are starting to get vicious), I now feel compelled to chime in again with an appeal to reason. Once again, my line of reasoning comes from Wheeler's texts and seminars. I have read and heard many statisticians on control charts, but his reasoning and the evidence he presents, while "heretical" to the ears of traditionalists, is very convincing. It is also interesting to note that he ran most of his material by Dr. Deming prior to publication. Dr. Deming apparently approved of what he read, judging from the Forward to Understanding Statistical Process Control (and from other letters Dr. Deming wrote to Dr. Wheeler over the years). Don told me, "Dr. Deming was never shy about telling me when he thought I was misguided about anything." I asked Don specifically about the material presented on using XmR charts for count data. He said, "Yes, Deming was very interested in it. He loved the material in Understanding Statistical Process Control." I don't think it's a matter of whether Dr. Wheeler is credible or not; if Dr. Deming thought he was a credible resource, who am I to argue? Besides, I've read all his books. I've been to his seminars, and I have corresponded with him quite a bit. The ideas he presents are not what we learned in school, and not what we have read in most texts, but the bottom line is, they work. He has presented a cogent, coherent argument for a very practical approach which has worked time after time. Further, he has reexamined some concepts in light of theory, and is able to show that the theory actually tends to support this approach, rather than the converse. He has data and experience to back up the theory. Advanced Topics in Statistical Process Control could be the most complete argument on control charts since Shewhart's Economical Control of Manufactured Product. I haven't been able to find any better; this isn't to say that I am not still searching. I have read a lot of arguments, but most are long on pure theory, "what we learned in basic statistics," and paradigm-bound. Wheeler makes these statements that seem outrageous, but he presents very clear, logical, arguments to back them up, then goes on to present data, REAL WORLD data, to show that the theory, and the argument, hold up very well. I'm probably the last person anyone should listen to in advancing these theories. I don't have a PhD (yet), and although I read everything I can find, I obviously can't read everything. I am just a person in search of knowledge like everyone else on the DEN. The problem I see with most of these arguments is they appeal to limited aspects of some of the theoretical ideas, and generally come without conclusive evidence for support. I also sense that many of those arguing with Wheeler's ideas have not yet read his books, because instead of directly addressing his arguments, they mostly say, "it can't be true because it's not what I was taught." The two main arguments I've seen recently concerned (a) the shape of the distribution/central limit theorem and (b) the use of XmR charts for count data. I'd like to quote from section 5.2 of Advanced Topics in SPC to (try to) answer the first argument. Wheeler talks first about the fact that the CLT only applies to averages, not to ranges, then he says: "The second reason that the central limit theorem cannot be said to be the basis for control charts is the conservative nature of three-sigma limits. When you have already bracketed approximately 99% to 100% of the values by brute force, one does not need to appeal to any theoretical arguments to understand that a point outside the limits is very likely to represent a signal. The conservative nature of three-sigma limits makes the central limit theorem irrelevant. "While Walter Shewhart did mention the Central Limit Theorem for subgroup averages on pages 181-182 of his 1931 book, this was not the operating basis for the computation of control limits. He merely used the Central Limit Theorem for averages to support the claim that the Camp-Meidell Inequality may be used in lieu of the more conservative Tchebycheff Inequality. Following this discussion of the control chart for Subgroup Averages, Shewhart discussed control charts for: (1) Mid-Ranges, (2) Root Mean Square Deviations, (3) Subgroup Variances, (4) Subgroup Ranges, (5) Skewness, and (6) Kurtosis. In each of these cases Shewhart noted, and empirically demonstrated, that the conditions for the Camp-Meidell Inequality are not satisfied. (There is no Central Limit Theorem for measures of dispersion or measures of shape.) Thus, Shewhart returned to the Tchebycheff Inequality as his justification that one may establish meaningful control limits for these various statistics. Between page 174 and page 213 of Economic Control of Quality of Manufactured Product, Shewhart argued that there need be no stronger condition than Tchebycheff's Inequality in order to establish a reasonable control chart scheme. He then continued to refine his arguments for another 100 pages before giving the definitive guidelines of using three-sigma limits. "In other words, the Central Limit Theorem for Subgroup Averages is a true theorem, and it does facilitate our work with sample averages in many situations. However, when it comes to the use of three-sigma limits, the existence of a Central Limit Theorem is irrelevant. ^Regardless of the distribution of the sample statistic, virtually all of the values will fall within three-sigma limits whenever the process displays statistical control.^ "Undoubtedly, this myth has been one of the greatest barriers to the effective use of control charts with management data nad process-industry data. Whenever data are obtained one-value-per-time-period it will be logical to use "subgroups of size one." However, if someone believes this myth, they will feel compelled to average something in order to invoke th blessing of the central limit theorem, and the rationality of the data analysis will be sacrificed to superstition." Concerning the second argument, one argument against using XmR charts for counts has been the risk of masking special cause data due to the way the chart is calculated. Dr. Wheeler freely acknowledges that there are fewer degrees of freedom for XmRs, so they usually require more data to firm up the control limits. He also notes that as a general rule, it will be a bad idea to use an XmR if your count per area of opportunity is less than one. However, he gives a data set in section 11.2, some real-world data, for a film producing process, counting blemishes in the film. The data for line 2 are: 12, 9, 19, 6, 13, 15, 8, 11, 9, 11, 9, 10, 10, 13, 13, 11 If you do an XmR and a c-chart for these you find: "While the limits found using the XmR chart do differ slightly from those found using the c-chart, they do not differ appreciably (note: less than 1/10th of a blemish-RS). Moreover, the Moving Range Chart identifies an anomaly on line two that is not identified by the c-chart--the drop from 19 to 6. Such a dramatic drop in the number of blemishes could be a very important clue on how to improve the performance of all the lines, and it will only be detected if one is using the mR chart." These are the short answers, I guess. If anyone wants longer explanations, my advice is to read the book. My intention in giving these quotes is not to directly argue the points myself, but to (hopefully) pique some interest in what is, apparently, a paradigm-breaking publication. I hadn't realized the immense controversy these ideas would engender. Rip Stauffer Naval Leader Training Unit Ripstaur@aol.com (Quotations from Advanced Topics in Statistical Process Control are used by permission of the author.) =======================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Deming Questions # 20/Gogue
gogue@cri.ensmp.fr (GOGUE J.M. Societe MAST 39 50 99 67)
Fri, 19 Jul 96 11:35:47 +0200
[Next of thread] [Next by author] [First of thread] [First by author]-------------------------- DEMING QUESTIONS -------------------------- A weekly paper including a set of questions copied in the Deming book OUT OF THE CRISIS Chapter 5. Questions to Help Managers. By Jean-Marie Gogue ----- # 20 ----- 1. (No 39 in the Book) - Reliability of inspection and test a) How reliable is your inspection at each of these points? How do you know? b) What data have you to show whether your inspectors are in line with each other? c) What about your test instruments, or rather, your use of them? Can you present evidence of statistical control of the system of measurement or classification? Visually? Or by instrument? COMMENTS Perhaps some readers may think they are not concerned, but inspection exists everywhere. Administration, police, schools, universities, department stores, wine shops, doctors, etc. have inspection. Even families with children have inspection. The concept of inspection suffers from the Taylor's cliche' of the inspector in a factory , sorting out defective products. But Deming was not an engineer, and his teachings were not devoted to factories. In the Deming philosophy, inspection is one of the three steps of the universal cycle proposed by Shewhart in 1938: Specification, Production, Inspection, that he transformed into the Deming cycle: Design, Make, Put on the market, Test in service. Thus inspection is related to Knowledge. Misunderstanding about the aim of inspection leads to a poor inspection system, that is a big source of waste. This question is a gold mine. ----- 2. (No 40 in the Book) - Optimizing the cost of inspection a) Where is inspection being carried out where no inspection would minimize total cost? b) At which points are you carrying out no inspection where you ought to carry out 100 per cent inspection to minimize cost? (See Ch. 15.) COMMENTS I remember visiting a French manufacturing plant with Dr. Deming in 1980. In the inspection and test areas he asked questions about the cost of materials, the investments, the time of operations, the percentage of defects. Two weeks later I received a letter where he explained that their inspection system was far from the optimum. In some places they were under control, with almost no failures, but 100 per cent inspection. In other places, no inspection, but out of control with a huge cost of defects. He made calculations to estimate the possible savings: about 2 percent of their sales. ---------------------------------------------------------------------------- Jean-Marie Gogue President The French Deming Association Versailles France gogue@ensmp.fr ==================================================================[Next of thread] [Next by author] [First of thread] [First by author]
Applications for Chaos?/Griffiths
Ian Griffiths <100326.1264@CompuServe.COM>
19 Jul 96 09:37:23 EDT
[Topic List] [Next by author] [First of thread] [First by author]In response to Steve Prevette's note re Chaos and Randomness: This is just a comment on points raised in Steve's note. I am still very unclear about the practical importance for business systems of work being done on chaotic behaviour. But my guess is that it will be, AT LEAST, insightful -- if only in helping us better to classify problem types. It may do much more. We need to find out. It is useful to know there are business problems (characterised by small numbers of players) where game theory can be helpful, and others where the number of inluences (or players) is very high and statistical thinking is fruitful. It is also helpful to know what are the 'limits or boundaries on the useful'. In mathematics it is of practical value to be able to prove that some things cannot be done (so we don't waste time attempting to calculate or prove something that is unachievable). A century ago most scientifically educated people believed that the motion of planetary bodies was rigorously determined by Newton's Laws and (in principle) precisely calculable. For most practical purposes, we still act in the belief that this is very nearly true. But Poincare showed nearly a century ago that this was not really the case. His work laid the foundations of the serious study of chaotic behaviour, though he did not use modern terminology. The interesting thing here is that the motion of a planetary body can appear to be extremely regular for a long time and then (apparently out of the blue) it may change drastically. This happens without the 'system' changing in any way. It is not as if two bodies collide, or something of that sort. The STRUCTURE of the system is the same as before; it's just that the BEHAVIOUR of the system appears to become very different. The same sort of behaviour happens also in social and ecological systems. It is quite easy to provide a mathematical description of a number of interacting 'loops' of influence that exhibits 'ordinary' regular behaviour for long periods and then 'flips' into a surprising new sort of behaviour. The behaviour may not even be chaotic in a strict mathematical sense -- but it can be VERY surprising. The important point is that, to an observer, this looks very much like a change from 'in control' to 'out of control' behaviour by the system. BUT it would be futile to look for some new 'external cause'. The 'strange' behaviour is entirely natural and intrinsic to the system. In the real world there are a host of problems that would be better tackled if people had greater awareness of the statistical ideas developed by Shewart and Deming. We know that simple tools and techniques, coupled with an awareness of 'systems', and a concern for people, can be very fruitful. We have hardly started down this track of improvement. But lurking in the background is a set of new issues where we need to improve our understanding. Some of the problems are of major importance. For example, it is NOT enough to track the catch of a fish population without some prior understanding of the population dynamics. We now know this (there are reasonable theories and lots of experimental evidence) -- and we know there are lots of problems of this sort. These are certainly not just academic problems, even though much of the work currently being done in this area appears rather 'academic'. As understanding improves, we can expect the subject to become more 'practical'. We certainly need to do a lot more work in this area. Ian Griffiths email: 100326.1264@compuserve.com tel: (44) 01383 872937 ========================================================================[Topic List] [Next by author] [First of thread] [First by author]