Six Sigma
SIKS SIG-mah
sɪks ˈsɪɡməListen
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Syllable breakdown
Dictionary meaning
a data-driven quality management methodology aiming to reduce process defects to fewer than 3.4 per million opportunities (representing six standard deviations from the mean in a normal distribution); uses the DMAIC cycle (Define, Measure, Analyze, Improve, Control) for improvement projects; developed by Motorola in 1986 and championed by Jack Welch at GE in the 1990s; practitioners earn Belt certifications (Green, Black, Master Black Belt)
Examples
- After Six Sigma training, the team reduced their defect rate from 4% to 0.001%.
- The company trained 200 Black Belts to lead Six Sigma projects across all divisions.
Synonyms: 6 Sigma, DMAIC, process improvement
Pronunciation tips
Sigma (σ) is the Greek letter for standard deviation. Six Sigma means being six standard deviations from the mean — near perfection.
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