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The Lean Approach. Like Six Sigma, Lean is a tool used by businesses to streamline manufacturing and production processes. The main emphasis of Lean is on cutting out unnecessary and wasteful steps in the creation of a product so that only steps that directly add value to the product are taken.
What is Lean Six Sigma? Lean six sigma then is a methodology that looks to combine the best of both the lean manufacturing and the 6 Sigma approaches. In particular the emphasis is on obtaining the benefits of both methodologies, whilst minimizing any potential weaknesses.