Quick answer
Lean removes waste to speed flow (value-stream thinking); Six Sigma removes variation to cut defects (statistical control) — Lean makes it fast, Six Sigma makes it right; combined as Lean Six Sigma.
Lean
Waste categories (defects, waiting, overproduction, transport, overprocessing, inventory, motion) — flow efficiency.
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Six Sigma
DMAIC + statistics — reduce variation to near-zero defects (3.4 per million).
When each
Flow/speed problems → Lean; quality/variation problems → Six Sigma.
The combination
Lean Six Sigma: Lean’s speed + Six Sigma’s rigor — the standard improvement discipline in operations.
Bottom line
Lean removes waste to speed flow (value-stream thinking); Six Sigma removes variation to cut defects (statistical control) — Lean makes it fast, Six Sigma makes it right; combined as Lean Six Sigma.
FAQ
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