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The Availability Heuristic

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A heuristic is a general problem-solving framework (Tversky & Kahneman, 1974). You can think of these as mental shortcuts that are used to solve problems. Different types of heuristics are used in different types of situations, and the impulse to use a heuristic occurs when one of five conditions is met (Pratkanis, 1989):

The Representativeness Heuristic

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The representative heuristic describes a biased way of thinking, in which you unintentionally stereotype someone or something. For example, you may assume that your professors spend their free time reading books and engaging in intellectual conversation, because the idea of them spending their time playing volleyball or visiting an amusement park does not fit in with your stereotypes of professors.

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Related Experiment Video

Updated: Jun 25, 2026

Highlighting and Reducing the Impact of Negative Aging Stereotypes During Older Adults' Cognitive Testing

Highlighting and Reducing the Impact of Negative Aging Stereotypes During Older Adults' Cognitive Testing

Published on: January 24, 2020

The normalization heuristic: an untested hypothesis that may misguide medical decisions.

Scott K Aberegg¹, James M O'Brien

¹The Ohio State University College of Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, 201 Davis Heart Lung Research Institute, 473 West 12th Avenue, Columbus, Ohio 43210, USA. scottaberegg@gmail.com

Medical Hypotheses

|February 24, 2009

Summary

Many clinical decisions rely on the "normalization heuristic," assuming that correcting abnormal lab values improves patient outcomes. This study defines the heuristic and explores its limitations using historical and current examples.

Related Experiment Videos

Last Updated: Jun 25, 2026

Highlighting and Reducing the Impact of Negative Aging Stereotypes During Older Adults' Cognitive Testing

Highlighting and Reducing the Impact of Negative Aging Stereotypes During Older Adults' Cognitive Testing

Published on: January 24, 2020

Area of Science:

Medical Practice
Clinical Decision Making
Evidence-Based Medicine

Background:

Randomized controlled trials (RCTs) are key in medical practice.
When RCT evidence is lacking, clinical hypotheses guide decision-making.
A common hypothesis is that normalizing abnormal physiological parameters improves patient outcomes.

Purpose of the Study:

To operationally define the "normalization heuristic."
To discuss the limitations of the normalization heuristic in clinical decision-making.
To review historical and current examples of normalization practices.

Main Methods:

Literature review of historical and contemporaneous examples.
Conceptual analysis and operational definition of the normalization heuristic.

Main Results:

The normalization heuristic is a widely used clinical hypothesis.
Examples demonstrate the heuristic's application in medical therapeutics.
The heuristic's limitations as a decision-making rule are highlighted.

Conclusions:

The normalization heuristic, while common, is a fragile guide for clinical decision-making.
Understanding the heuristic's limitations is crucial for evidence-based practice.
Further research is needed to refine therapeutic strategies beyond simple normalization.