> No, I want management to develop a system to determine who is low-performing

The system here is going to be something like LoC or tickets answered, things that are objective and easy to measure. We know these don't reflect real productivity, but because they are objective, that's what will be used in promotion and firing decisions. Anything subjective, even if it's the opinions of peers or experts, will be contestable in due process hearings, creating risk for the employer, and will be deemphasized or eliminated. One reason why the US government and European software companies are relatively uncompetitive in hiring is because of the difficulties created by due process in firing bad employees and promoting good ones.