Deliberately consider the opposite hypothesis

For any belief you are testing, explicitly generate the strongest case for the opposing view.

Why it works

The "consider the opposite" intervention — generating explicit arguments for the opposing view — reduces confirmation bias by populating working memory with disconfirming content. This counters the availability asymmetry: without effort, confirming evidence is more cognitively available because it has been selectively attended to. Adding the opposing case to the analysis restores a more symmetric picture.

How to do it

1. State your current hypothesis or belief explicitly.
2. Spend five minutes generating the strongest possible argument for the opposite conclusion.
3. List at least three pieces of evidence that would support the opposite view.
4. Ask yourself: "If I believed the opposite, what would I be looking for?" Then look for it.

Evidence

Lord, Lepper & Preston (1984) showed that asking subjects to "consider the opposite" reduced confirmation bias in evaluating mixed evidence — one of the more reliable laboratory debiasing interventions. (rct)

Laboratory debiasing effects are smaller in real-world conditions with motivated reasoning (career stakes, identity investment). The practice helps but does not eliminate the bias.

Sources

• Lord, Lepper & Preston (1984), considering the opposite: a corrective strategy for social judgment, Journal of Personality and Social Psychology

Common mistake

Generating weak, easily dismissed counterarguments that make the original hypothesis look even stronger — what philosophers call "steelmanning" only as theater.