Employee Performance Reviews Do More Harm Than Good

"The worst part of performance reviews is the message you send overall — that work is an employee vs. employee competition. I can think of countless senior managers who lament how their employees don’t work well together and don’t collaborate. I can think of countless line employees (and senior managers) who complain about the brutal and vicious politics in their workplace. How surprising that people don’t work as a team when their personal compensation (and more importantly, their sense of self-worth) is impacted so directly by a system of employee vs. employee competition."

http://www.jacksonfish.com/blog/2009/05/21/employee-performance-reviews-do-more-harm-than-good/