Lean Definition

Five (5) Whys

Root cause Analysis – Taiichi Ohno’s practise of asking why five times whenever a problem was encountered, In order to identify the root cause of the problem so that effective countermeasures could be developed and implemented. Used along with other problem-solving tools, enables you to derive the proper corrective action. IS a question asking method used to explore the cause/effect relationships underlying a particular problem. Ultimately the goal of applying the 5 why’s method is to determine a root cause of a defect or problem.

Keep in mind the following key phrase as a background thought in any 5 why exercise: People do not fail, processes do!

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