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No. 300 · Your own mind · Human Nature and Judgement

First-Conclusion Bias

The first explanation that fits tends to become the only one we consider.

First-Conclusion Bias is our tendency to settle on the first explanation that fits, then bend new evidence to support it. Under pressure or in a crowd, early verdicts feel satisfying, but they are often incomplete or wrong.

To counter it, list several possible explanations before investigating, ask what evidence would prove you wrong, and pause before sharing or acting on breaking news. Hold early conclusions loosely.

In the Almanac

“Richard Jewell”, 1996 · “Reddit”, 2013

Both stories in full, three ways to use it and where it misleads.

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First Conclusion Bias

Questions

What is First-Conclusion Bias?

First-Conclusion Bias is our tendency to settle on the first explanation that fits, then bend new evidence to support it. Under pressure or in a crowd, early verdicts feel satisfying, but they are often incomplete or wrong.

How do you avoid First-Conclusion Bias?

To counter it, list several possible explanations before investigating, ask what evidence would prove you wrong, and pause before sharing or acting on breaking news. Hold early conclusions loosely.

When does First-Conclusion Bias matter?

First-Conclusion Bias is one of the 31 mental models for your own mind, the situations where you ask: Is my own thinking leading me astray? Within that, it belongs to “Seeing what you want to see”, alongside Blind Spot Bias, Cognitive Dissonance and Commitment and Consistency Bias.

What is an example of First-Conclusion Bias?

Two stories show it at work: Richard Jewell (1996) and Reddit (2013). Both are told in full in The Mental Models Daily Almanac, which has two stories for each of its 365 models.

Which mental models are related to First-Conclusion Bias?

Hasty Generalisation, Hanlon’s Razor and Anchoring. First-Conclusion Bias itself comes from human nature and judgement.