Confirmation Bias
Confirmation bias is the human tendency to favour information that confirms existing beliefs and to overlook or dismiss information that challenges them. It operates quietly: people ask questions likely to produce agreeable answers, weight supporting evidence more heavily than contradicting evidence, and remember the hits while forgetting the misses. It is one of the most pervasive cognitive biases precisely because it feels like ordinary reasoning rather than distortion.
The effect is well documented across psychology and decision-making, and it is a distinct problem from unconscious bias about identity — confirmation bias is about protecting a conclusion you have already reached. Once formed, an initial judgement becomes a lens that filters everything that follows, so early impressions are self-reinforcing rather than self-correcting. This is why it is so corrosive in evaluative settings: the assessment stops being a genuine test and becomes a search for supporting evidence.
In interviewing, confirmation bias is one of the most damaging and common distortions. An interviewer who forms a positive impression in the first few minutes — often on thin cues — then unconsciously asks easier questions, interprets ambiguous answers charitably, and remembers the candidate favourably, while doing the reverse for someone who made a weaker first impression. Structured interviews are the primary defence: asking every candidate the same questions, scoring against defined criteria as you go, and gathering independent assessments before discussion all interrupt the loop. Deliberately seeking disconfirming evidence — asking “what would make me wrong about this candidate?” — is a discipline that turns an interview back into a real test.
Frequently asked questions
What is confirmation bias?
Confirmation bias is the tendency to seek and favour information that supports what you already believe, while discounting evidence that contradicts it. It makes people look for reasons to confirm a view rather than to test it.
How does confirmation bias affect interviews?
Confirmation bias leads interviewers to form a quick first impression and then unconsciously gather evidence that supports it — asking easier questions and interpreting answers charitably for candidates they already like. The interview stops testing the candidate and starts confirming a snap judgement.
How is confirmation bias different from unconscious bias?
Confirmation bias is about protecting a conclusion you have already reached, regardless of who the person is. Unconscious bias is the broader tendency to hold automatic assumptions about people based on characteristics like gender, age, or background.
How can interviewers reduce confirmation bias?
Interviewers reduce it by using structured interviews — the same questions and scoring criteria for every candidate — and by recording independent assessments before group discussion. Actively asking what evidence would prove a first impression wrong also helps counter it.