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MIXORA CONCEPT

Representativeness heuristic

Judging probability by resemblance to a familiar category or story, sometimes with too little attention to base rates.

thoughtbridgeStrong evidence
IN PLAIN LANGUAGE

A case that looks typical can feel likely even when the category itself is rare. Similarity is useful evidence, but it must be combined with prevalence and the reliability of the observed cues.

What “Strong evidence” means

The core definition or effect is well established across authoritative standards, foundational research or a broad research literature. The label does not make every practical prediction certain.

Marker-board illustration created specifically to explain Representativeness heuristic: Judging probability by resemblance to a familiar category or story, sometimes with too little attention to base rates.VISUAL EXPLANATION · MARKER BOARD
Judging probability by resemblance to a familiar category or story, sometimes with too little attention to base rates.
EXAMPLE

A polished, technical explanation may feel more likely to be expert even when it comes from an unverified source.

COMMON CONFUSION

A representative example can genuinely be informative; the error is treating resemblance as sufficient probability evidence.

ASK YOURSELF

How common is this category before considering how well the case fits the stereotype?

RELATED CONCEPTS
thoughtHeuristic

A simplifying strategy or rule of thumb used to make judgments or solve problems efficiently.

→thoughtBase-rate neglect

Giving too little weight to how common an outcome is before considering case-specific evidence.

→thoughtProbability

A formal way to represent uncertainty or long-run regularity, depending on the interpretation used.

→thought × bridgeEvidence

Information that raises, lowers or otherwise constrains rational confidence in a claim.

→

SOURCES & TRUST

References

Last reviewed

  1. 01
    Judgment under Uncertainty: Heuristics and Biases

    Amos Tversky & Daniel Kahneman · 1974 · Science

    Classic account of representativeness, availability and anchoring in judgment under uncertainty.
    Academic source
What the source labels mean
Primary source
Original work, experiment, standard or historical text.
Academic source
Scholarly research or review published for an academic audience.
Reference source
An expert standard, encyclopedia or institutional explanation that summarizes a field.
General reference
A practical specialist resource useful for application, but not treated as decisive research by itself.