Lean Six Sigma (DMAIC phases in detail, DMADV for new processes, Six Sigma belt system, 8 wastes MUDA identification, process capability and Cpk, control charts types, measurement system analysis, cause-and-effect diagram, FMEA, hypothesis testing fundamentals in LSS, etc.) Cheat Sheet

Lean Six Sigma combines Lean's waste-elimination focus with Six Sigma's statistical defect-reduction methods to create a powerful continuous improvement methodology. At its core, Six Sigma targets 3.4 defects per million opportunities (99.99966% accuracy), while Lean eliminates non-value-adding activities through systematic process analysis. The DMAIC framework (Define, Measure, Analyze, Improve, Control) guides improvement of existing processes, while DMADV (Define, Measure, Analyze, Design, Verify) creates new processes optimized from inception. Understanding the distinction between common cause variation (inherent to the process) and special cause variation (assignable to specific factors) enables practitioners to apply the right tools—from statistical process control to root cause analysis—creating sustainable improvements that balance speed, quality, and cost.