The Caterpillar Way by Craig Bouchard

Author:Craig Bouchard
Language: eng
Format: epub
Publisher: McGraw Hill LLC
Published: 2014-08-15T00:00:00+00:00

What Is Six Sigma, and How Is It Connected to Lean Manufacturing?

Six Sigma is a technique that focuses intently on product quality and the elimination of product defects. With Six Sigma, teams of people are created who work together to identify and implement opportunities to improve product quality and eradicate errors. The name is derived from the statistical notion of six sigmas from the mean. A sigma is a standard deviation; an outcome six sigmas away from the mean of a distribution reporting product errors is extremely rare. Specifically, the probability of an outcome that is six sigmas away from the mean of a normal distribution is less than 0.0000001. The guiding notion of Six Sigma, then, is essentially to cause product errors and defects to disappear. This is what a 0.0000001 probability implies.

Somewhat confusingly, a Six Sigma level of defect-free and error-free production has become associated with having only 3.4 defects per million possibilities. Statistically, however, this corresponds to only 4.5 standard deviations away from the mean in a normal distribution.

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