[JFlash]

Beat me to it. When I interviewed at Google there were multiple interviewers and then there were multiple committees and people who look at their feedback.

Comparing interviewers to other interviewers makes a "He did above average" from a person who's hard to impress as good as a "She did really great!" from someone else.

[robrenaud]

Well, the hiring committees see the entire prior rating distribution from each interviewer as well as the hires/no hires for each previous rating.

So the committees has a decent way of correcting for interviewers who use different scales.

[JFlash]

Right. You'd only know someone was "hard to impress" with that information.