What 'Moneyball' should teach us about job interview bias

3 simple rules to encourage evidence-based assessments.

The movie ‘Moneyball’ based on Michael Lewis’ book tells a real-life story of a professional baseball team and its innovative approach to player valuation. The Oakland A’s were a low-budget team forced to play against teams with significantly greater resources.

Job Interview Bias

In order to compete against larger teams, Oakland A’s manager Billy Beane (played by Brad Pitt in the movie) decided to adopt a revolutionary strategy: to pick players based on their performance statistics.

Using this innovative approach, the team wins 20 consecutive games, something that had never happened before in the history of the sport.

It changed the way professional baseball teams look at data and player valuation.

Unconscious Bias

The whole professional baseball market turned out to be valuing players incorrectly.

Until then, player valuation relied solely on scouts’ judgment. The main problem was that scout’s judgment turned out to be heavily influenced by human bias.

Some of the most common biases are the Attractiveness, Similarity, Anchoring or Confirmation Bias.

In the baseball players' market, the effect of human bias was so strong that simple statistical measures turned out to be better predictors of success.

When I’m finding people for a job, I’ll look for someone who doesn’t ‘look right’. If someone doesn’t ‘look right’ as a doctor, they’re almost certainly a great doctor.

Michael Lewis, Author of ‘Moneyball: The Art of Winning an Unfair Game’

This insight raises an important question: if baseball was so poorly understood by experts, is it possible other the same thing happens in other industries?

The answer seems clear: yes.

Over the past decades, the same techniques have started being applied successfully to various other fields, from NBA drafts to the Israeli army.

"Employee Scouts"

Recruiters are nothing more than employee scouts. We interview candidates and then judge on how they would likely perform on the job.

The problem is, we don’t seem to be very good at it.

A comprehensive research review by Schmidt and Hunter suggests that structured interviews are faulty predictors of performance. Significantly better predictors were general work sample tests, mental ability tests and integrity tests.


Nevertheless, adoption of these methods seems to face an uphill battle.

As one HBR article suggests, “managers are overconfident about their own expertise and experience, and they dislike deferring to more structured approaches that might outsource human judgment to a machine.”

It is not only naive, but plain wrong to assume we’re not subject to these biases.

I’m biased. Now what?

Unfortunately, knowing we’re biased doesn’t help us guard against bias. We need to establish the right processes in order to prevent them.

How can we deal with these dueling needs of an objective assessment of skills and a subjective assessment of character?

One answer is what the team at Basecamp does. They rely on an initial screening based on objective criteria. Then, once they’re confident that the candidates who remain are able to do the job effectively, they present them to the team.

If after the team meeting phase they dislike the candidate for some reason, they just won’t hire them. What they accomplish with this strategy is to separate the objective criteria from the subjective.

Proposed Strategy

There are 3 simple but effective rules you can implement to reduce screening bias and encourage an evidence-based assessment:

  1. Conduct technical assessments. The more these technical assessments resemble the work the person will be doing, the better predictors of performance they are. General mental ability and integrity tests also seem to be useful.

  2. Conduct structured interviews. Most job interviews are still unstructured, and thus particularly prone to bias. Structured interviews follow a written script and interviewers fill out a scorecard based on the candidate’s answers. Interviewers shouldn’t be able to see other interviewer scorecards before completing their own.

  3. Use facts, not gut feelings to justify decisions. It’s often useful to have a final step of the process where you encourage the team to meet the top candidate and share their opinions on them. On these debrief sessions, ask the team to provide facts, details and specific examples about the candidate, not just gut feelings.


Reducing bias in job interviews is both fairer for candidates and better for employers. Take advantage of these strategies but keep in mind that it may take some time to remove bias from candidate assessments.

Miguel Marques
Written by Miguel Marques Founder @ Remote Crew
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