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It’s usually hard to measure the things we care about. So we compromise. What makes a metric good? In an ideal world, you could pick the thing you want to make better (say, “How productive are my users?”) and then measure it precisely. But since it’s rare to be able to take realistic measurements in reply to such a question, we need to come up with something else that we can actually measure. If you look around, you’ll find that most metrics we use are only an approximation of the real thing we...