Most managers are unable to adjust for their own biases, though. I'm especially skeptical of managers who evaluate themselves as having above average technical

Most managers are unable to adjust for their own biases, though. I'm especially skeptical of managers who evaluate themselves as having above average technical ability after they have asserted how poorly most people evaluate their peers. The necessary conclusion of such an assertion is that people therefore haven't a rational basis on which to judge their own skills relative to others.