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What is the 5 Whys technique?

The 5 Whys is a technique used to determine the root cause of an issue. By repeatedly asking the question “Why” (five is a good rule of thumb), you can discover symptoms which may lead to the reason a problem exists.

Liberating Structures defines a similar technique called Nine Whys. It's literally more of the same.

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Fishbone Diagrams, Influence Diagrams

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