Both "they work" and "they don't work" are unsupportably broad. Google has substantially reworked their interviewing process on at least one occasion, producin

Both "they work" and "they don't work" are unsupportably broad. Google has substantially reworked their interviewing process on at least one occasion, producing a big change in results. Story here: http://www.nytimes.com/2013/06/20/business/in-head-hunting-big-data-may-not-be-such-a-big-deal.html?pagewanted=all&_r=1 http://www.nytimes.com/2013/06/20/business/in-head-hunting-b... Meanwhile it's crucial and nigh-impossible to identify how much success is based on interview performance as opposed to selection effects in who interviews, and how interviewers see different candidates.