Six Sigma - the Latest Approach in the Ongoing Development of Strategies for Business Improvement. Use of analytical methods has grown steadily for over 80 years Statistical quality control (origins in 1920, explosive growth during WW II, 1950s) Operations research (1940s)
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The original six sigma concept (Motorola) Emphasis on Achieving Significant Business Impact
Walter A. Shewhart, 1891 - 1967
Deming, about 1980