is detailed here; it's a wonderful method.
And it reminds me of this story an old boss told me, repeated for Og and for Denny, who used to work for IBM:
One day three IBM people rented a car; a salesman, a hardware engineer and a software engineer. About forty miles out of town they had a flat.
The salesman stood looking at the car and said, "We need a new car".
The hardware engineer looked at it and said "Let's start swapping tires until we find which one's the problem".
The software engineer said "Well, let's watch it a while; maybe the problem will fix itself".
And they're still sitting there.
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