Re: Where is the Evidence

[Lloyd Provost <lprovost@fc.net>]

> David K noted: <As for "Where is the evidence?" it is staring you in the
> face,
> if you have eyes to see, every time you draw an SPC chart.>>
>
> >>As for "Where is the evidence?" it is staring you in the face,
> if you have eyes to see, every time you draw an SPC chart.>>
>
> It seemed worth repeating.    JDKromkowski

Some Shewhart charts that I draw are full of special causes. For other
charts, all the variation I observe is common cause. Some charts have one
or two indications of the presence of a special cause. One time I reviewed
a chart of about 40 data points with no points inside the control limits.

How are you suggesting that I should use my experience in developing
Shewhart charts (and others use their experiences) to provide evidence for
Deming's statement (page 33 of NE): "In my experience, most troubles and
most possibilities for improvement add up to proportions something like
this: 94% belong to the system (responsibility of management); 6% are
attributable to special causes."

Lloyd Provost
Associates in Process Improvement
lprovost@fc.net
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