What is Lean? Lean is the same as Lean manufacturing or Lean production. Indeed, it is a method elaborated based on the Toyota Production System back in the 30s, renamed today the Toyota way. Sometimes, it is known as LSS, Lean-Six Sigma when Lean is bundled with the 6 Sigma (6σ) approach. As a matter of fact, quality target in 6 Sigma (6σ) is to reach the 5 nine quality (99.99966%% perfect).
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