well a good teacher could probably notice whether his colleagues are good teachers quite easily (at least if he had access to their classes etc.). Now that I th

well a good teacher could probably notice whether his colleagues are good teachers quite easily (at least if he had access to their classes etc.). Now that I think about it: colleagues probably are the best metric even for jobs like programmers (at least if they work on the same project/codebase) etc. However, it would be socially problematic if your colleagues were responsible for deciding your pay raises.