Thanks to all who responded to my request for information on this 
subject.  I spoke on the phone with Dale Wilheit at IBM Austin, who added 
something that may be of interest.  In his operation, he uses the 
technique of "pre-control", which I believe was proposed by Dorian 
Shainin.  At the end of every shift (3 per day) the operator takes a 
reading with a UV power meter and plots it on a pre-control chart.  The 
pre-control technique is a very simple imitation of SPC.  Dale said he 
has a lot of turnover, so doesn't want to spend time training operators 
in SPC.  Pre-control is quick and easy, and would seem to give him a 
substantial portion of the information and guidance that true SPC would.
Lou Hart


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