Before you try...Before you try to solve a problem, define it.
Before you try to control a process, understand it.
Before trying to control everything, find out what is important.
Start by picturing the process.
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John T.Burr, Quality Program(June 1990),p.64
转载于:https://www.cnblogs.com/CampFeather/archive/2006/03/30/362498.html
