Why your gut is a terrible interviewer

Most managers interview by feel: chat with a candidate, see if there's a spark, and trust their instinct. Decades of research say that instinct is close to worthless. In their landmark 1998 meta-analysis of 85 years of hiring data, psychologists Frank Schmidt and John Hunter found that the free-flowing unstructured interview is one of the weaker predictors of job performance — while a structured interview predicts noticeably better.

The difference isn't the questions being harder. It's consistency. A structured interview asks every candidate the same job-related questions and scores answers against a defined rubric decided in advance. That kills the two things that quietly wreck hiring: first-impression bias (deciding in the first 30 seconds, then hunting for evidence to confirm it) and similarity bias (favoring people who remind you of yourself).

Google reached the same conclusion internally. Through its re:Work research, the company standardized on structured interviews precisely because unstructured 'gut feel' sessions weren't predicting who would actually succeed. The uncomfortable takeaway for new managers: the candidate you 'just clicked with' is often a story your biases told you, not a signal about the work.