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Statistical discipline for reducing defects and variation.
Engineer Bill Smith (1929–1993) proposed Six Sigma at Motorola in 1986; Mikel Harry systematized it; and Jack Welch's General Electric made it a global management movement in the 1990s. Its belts, DMAIC cycle, and defect mathematics industrialized the quality revolution — statistical discipline as leadership infrastructure.
Six Sigma industrialized Deming's statistical thinking into belts, DMAIC, and defect targets — quality as a management infrastructure deployed at scale by Motorola and GE.
The era: Dynamic Interaction — A dynamic, interactive influence process among individuals in groups; emphasis on managing environmental cross points.
Statistical discipline for reducing defects and variation.
This theory sits in the Dynamic Interaction era of the map: A dynamic, interactive influence process among individuals in groups; emphasis on managing environmental cross points.
Use DMAIC where defects are costly and processes repeat.
Keep statistical discipline out of work that needs variance — creativity, research, strategy.