six sigma lean production system theory of constraints
Six Sigma grew from Motorola in the early 1980’s, based on traditional quality methods from pre-World War II. Belt levels were modeled after the martial arts to show proficiency. General Electric took the approach to another level with management promotion and cost savings based on Six Sigma results. Lean originated from Toyota after World War II. Over the years, the model for success has been captured and modeled by groups like Shingajutsu, Lean Enterprise Institute, and Cardiff University, although none have been able to replicate their success. A management philosophy introduced by Eli Goldratt in his 1984 book titled The Goal, which describes a system as being limited by a few critical constraints that should be identified and resolved above all other improvements.

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