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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.
In order to answer the question, what is lean six sigma, it is first necessary to understand the two constituent parts which are lean manufacturing and 6 Sigma. These are two different business improvement methodologies that have become popular due to the many documented successful implementations.