Re: Six Sigma

[GrantBlair@aol.com]

In a message dated 3/27/2000 9:06:43 AM Eastern Standard Time, 
mmedia@ozemail.com.au writes:

<< Let's get real here, if a process has drifted by 1.5
 sigma in the "long" term (whatever "long" might happen to be) or
 overnight, the process in NOT in control.>>
Anyone who has ever actually controlled processes would NEVER say  the mean 
of a process will NEVER change just because the
process is being measured...they know better from experience. The only 
question
to ask is...when it does change, how much can it change before a control 
chart can
detect it....is it 1 sigma, or 1.5 sigma?
 <<If it is not in control it is impossible to produce a predictable outcome. 
>>
Another unrealistic statement. If I'm producing toothpicks and my control
chart shows ANY type of special cause, I may be less stable than when
I was under control, but I can assure you I will NEVER produce an single 
toothpick
the size of a telephone pole any time in the near or far future. You still 
have
predictability in a process with special cause...all you have done is widened 
your limits.

GrantBlair@aol.com
Ninety Six SC
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