I think that openeyes pretty much hit the nail on the head. I tend to just know the answer without really thinking about it. The approach that I take to most "real world" problems is this: Look at the problem, and take the first solution that comes to mind, and assume that it is correct. Then run through the solution in my mind and try to prove it wrong. While doing that, think of possible branches as I trace the path to my solution. If I decide that I was wrong, go back and try one of the alternate branches. If I don't have the time to do that (I generally don't spend more than 30 seconds on anything that I deem is unimportant, and usually no more than 5 minutes on something that is important), then I just assume that my first solution is correct, and take the action. In other words, I generally just trust my instincts.
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