Consider the opposite before finalizing a judgment

Deliberately generate the case for the conclusion you are not reaching.

Why it works

Confirmation bias and motivated reasoning share a mechanism: the working hypothesis determines what you notice and encode. The "consider the opposite" instruction directly interrupts this by forcing the cognitive system to search for evidence in the opposite direction, partially counteracting the selective attention that produces the bias. Even a brief forced consideration reduces the effect in experimental studies.

How to do it

1. Before finalizing any important judgment, write the headline of the opposite conclusion.
2. Spend two minutes generating the best evidence and arguments for that opposite view.
3. Ask: "How strong is this case? What probability does it deserve?"
4. Adjust your original confidence estimate to reflect this forced-considered alternative.

Evidence

Lord, Lepper and Preston (1984) found that instructions to "consider the opposite" significantly reduced biased assimilation of mixed evidence compared to control conditions. (observational)

Effect sizes are moderate; the debiasing is partial rather than complete, and high motivation to reach a directional conclusion attenuates the benefit.

Sources

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

Common mistake

Generating the opposite case in a half-hearted way that confirms how weak it is, rather than making it as strong as possible — which reproduces the original bias in a new form.