six sigma quality

**Six Sigma Quality** is a **manufacturing quality philosophy and methodology targeting a process capability of 6 standard deviations between the process mean and the nearest specification limit** — corresponding to 3.4 DPPM (defects per million opportunities), representing near-perfect manufacturing quality. **Six Sigma Framework** - **6σ Capability**: Process mean is 6σ from the nearest spec limit — even with 1.5σ drift, only 3.4 DPPM. - **DMAIC**: Define, Measure, Analyze, Improve, Control — the systematic improvement methodology. - **DMADV**: Define, Measure, Analyze, Design, Verify — for new process/product design. - **Belt System**: Green Belts, Black Belts, Master Black Belts — trained practitioners who lead improvement projects. **Why It Matters** - **SPC Foundation**: Six Sigma builds on SPC — using data-driven process control to achieve near-zero defects. - **Cost Reduction**: Reducing defects reduces rework, scrap, and warranty costs — quality improvement pays for itself. - **Cultural**: Six Sigma is both a methodology and a quality culture — systematic problem-solving embedded in the organization. **Six Sigma** is **near-perfection by design** — a data-driven quality methodology targeting 3.4 defects per million opportunities through systematic process improvement.