Have you ever heard of the five whys? I came across it in a business context, the idea is when trying to find the root cause of a problem if you ask "why" five times you should identify the real issue. In the course of my work, identifying business requirements, the idea was that each proposed requirements should hold up to five whys.
If you can't continue to give good answers to at least five whys then maybe you shouldn't be doing whatever it is you were planning. It can be a very effective technique. But I'll tell you this much: it wears thin really quick when it's being used by someone who's already pissing you off.
http://au.youtube.com/watch?v=TqVYI58nu7o
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