What is Six Sigma? It's a systematic way to solve problems involving defects and deviation.
You only need a handful of tools to solve most problems:
1. Control charts of current performance (and to monitor performance after improvement.
2. Pareto charts (for defects) and histograms (for variation)
3. Ishikawa - Fishbone diagrams for root cause analysis
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A very good primer on Six Sigma principles
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