[Azkar]

Solutions usually come from people who see in the problem only an interesting puzzle, and whose qualifications would never satisfy a select committee. -- John Gall in Systemantics[1]

A very short read, and quite interesting. It touches on a lot of the same points already made in this thread (people will game metrics, etc). The biggest argument that the book makes that is trying to set up a system to accomplish something will cause the system to do everything but accomplish its goal, which leads to the above quote. You can't set up a system to achieve a goal, only set up an environment that allows the goal to be achieved.

[1] https://en.wikipedia.org/wiki/Systemantics