[latch]

For very large companies with hundreds of projects, figuring out the "bottom 10%" can be challenging. An average developer on a poor team will look like a rockstar to his/her manager, while a really good developer on a stellar teams will look average at best.

[ericb]

You're talking about average and good. I'm talking about firing "terrible." I find cowardice often prevents hiring mistakes from being corrected quickly, and the accuracy of the interview process is not high enough to prevent those bad hires consistently at most companies.