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The 5 Whys is a question-asking method used to explore the cause/effect relationships underlying a particular problem. Ultimately, the goal of applying the 5 Whys method is to determine a root cause of a defect or problem. The following example demonstrates the basic process: My car will not start. (the problem) 1. Why? - The battery is dead. (first why) 2. Why? - The alternator is not functioning. (second why) 3. Why? - The alternator belt has broken. (third why) 4. Why? - The alternator belt was well beyond its useful service life and has never been replaced. (fourth why) 5. Why? - I have not been maintaining my car according to the recommended service schedule. (fifth why, root cause) |
5 Whys