In 2016, Google's People Analytics team studied years of interview data. They found that interviews predict hiring decisions with % accuracy. More interviews did not improve predictions.
% of the time, a panel of interviewers made the same decision as panels with or more. Google implemented the "Rule of Four" and cut time-to-hire from - months to about days.
Sundar Pichai, now CEO, went through interviews in 2004. Today, most candidates face -.