Okay, I promised I'd stop talking about metrics, but it occurred to me that there's a serious point I hadn't covered: sometimes your measures are broken, and you need to fix the measure before it's going to tell you anything useful. The classic example of this is error reporting: if you're reporting too many errors, you won't notice when something serious is going on. I once saw a system that generated 2400 errors a week. That's under unexceptional circumstances. Assuming you spent 30 seconds on each error, that would take over half your week. It doesn't take a genius to...