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Explanation: Where I work, the term refers to the type of analysis performed to find the reason for problems. The basic idea is to repeatedly ask なぜ？, until you get to the deepest root of the problem you're analyzing. Let me give you an example:
The machine broke down - なぜ？
Because the rubber seal deteriorated - なぜ？
Because it wasn't changed for 3 years - なぜ？
Because there's no policy for regular seal change - なぜ？
...and so on, and so forth.
Krzysztof Łesyk Japan Local time: 05:55 Native speaker of: Polish PRO pts in category: 16