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History of Lean Six Sigma

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This Solution outlines the evolution of the concept of Lean Six Sigma which is basically a combination of Lean Manufacturing and Six Sigma.

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The evolution of Lean Six Sigma with the contribution of various people is examined.

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Historical Overview & Evolution of Six Sigma
The Central statistical principle of Six Sigma is the Normal Distribution curve. The bell shaped curve was put forth by Friedrich Gauss (1777-1855). The standard deviations from the mean of the Bell Curve are denoted by the greek alphabet 'σ' ('sigma'). 'σ' as used in quality control denotes variability from the acceptable standards.
In the 1920s Walter Shewart used the sigma concept to show that a variation of '3σ' indicates that the process needs correction. There were many other concepts that were introduced later such as CP, CPk and the concept of zero defects.
In the 1980s it was Bill smith of Motorola who coined the word "Six Sigma". This was when Mr Galvin was Chairman of Motorola. It was felt that that 'defects per thousand opportunities' did not provide the level of quality that was desired. They wished to measure DPMO or defects per million opportunities. Motorola realized ...

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