QEHSQuality
Six Sigma
A data-driven improvement methodology targeting 3.4 defects per million opportunities.
Six Sigma uses the DMAIC cycle (Define, Measure, Analyse, Improve, Control) for improvement projects and DMADV for new designs. Practitioners are certified at White, Yellow, Green, Black, and Master Black Belt levels. Motorola originated it; GE popularised it. When combined with Lean (waste elimination), the result is Lean Six Sigma — the dominant manufacturing excellence framework.