Decision technique

Base-rate check

Compare a vivid case with the broader frequency or distribution that should inform the judgment.

When to use

A specific reasoning move for a specific problem.

When one story, recent event or exceptional example is carrying too much weight.

Procedure

Run the technique.

  1. State the event or outcome you are judging.
  2. Find the relevant denominator or broader comparison set.
  3. Estimate the base rate before focusing on case-specific details.
  4. Explain what case evidence is strong enough to move away from that baseline.

Limit

What this technique cannot guarantee.

Base rates can be irrelevant if the comparison population is badly chosen.

Situations

Where this may be useful.

Use inProduct prioritization

Review roadmap choices without letting the loudest request, recent event or prior investment define value.

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Use inForecasting under uncertainty

Make a forecast that can later be checked, updated and learned from.

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Use inChecking a repeated claim

Test whether repetition represents independent evidence or only makes a claim feel familiar.

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Evidence-linked concepts

Why this check may matter.

Related lensAvailability Heuristic

Read the evidence and limits before treating this technique as relevant.

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