Sometimes people have a very hard time debugging. Mostly, these are people who believe that in order to debug a system, you have to think about it instead of looking at it. Let me give you an example of what I mean. Let’s say you have a web server that is silently failing to serve pages to users 5% of the time. What is your reaction to this question: “Why?” Do you immediately try to come up with some answer? Do you start guessing? If so, you are doing the wrong thing. The right answer t...
