(8) What happens during a Google hiring committee meeting? - Quora

(8) What happens during a Google hiring committee meeting? - Quora

Because extra interviews were expensive in time and effort, we would try to get to a decision with the information available.

We would often accommodate observers.  These would be engineers previously trained as interviewers and with some experience with interviewing.

About once a quarter we would review our statistics and look at how often our decisions were upheld or overturned by the next-more-senior committee (our decisions flowed up to a committee of VPs and Directors that could affirm or reverse our decisions and adjust the scores).  We also looked at broad statistics, though I don't remember precisely what.

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