December 2002
Intermediate to advanced
848 pages
20h 22m
English
Content preview from The Six Sigma Handbook, Revised and Expanded, 2nd Edition
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2.2. SIX SIGMA VERSUS TRADITIONAL THREE SIGMA PERFORMANCE
The traditional quality model of process capability differed from Six Sigma in two fundamental respects:
It was applied only to manufacturing processes, while Six Sigma is applied to all important business processes.
It stipulated that a "capable" process was one that had a process standard deviation of no more than one-sixth of the total allowable spread, where Six Sigma requires the process standard deviation be no more than one-twelfth of the total allowable spread.
These differences are far more profound than one might realize. By addressing all business processes Six Sigma not only treats manufacturing as part of a larger system, it removes the narrow, inward focus of the traditional ...
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