Fourth, we add a “cross-functional interviewer,” someone with little or no connection at all to the group for which the candidate is interviewing. For example, we might ask someone from the legal or the Ads team (the latter design the technology behind our advertising products) to interview a prospective sales hire. This is to provide a disinterested assessment: A Googler from a different function is unlikely to have any interest in a particular job being filled but has a strong interest in keeping the quality of hiring high.