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Types of Heuristics: Availability, Representativeness & Base-Rate

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Cynthia Burton
Expert Contributor
Jenna Clayton

Jenna received her BA in English from Iowa State University in 2015, and she has taught at the secondary level for three years.

Heuristics are techniques that allow the human brain to make efficient decisions in everyday life. Explore the different types of heuristics, including availability, representativeness, and base-rate. Updated: 10/16/2022


We make decisions and judgments every day - if we can trust someone, if we should do something (or not), which route to take, how to respond to someone who's upset... the list goes on and on. If we carefully considered and analyzed every possible outcome of these decisions and judgments, we would never do anything else!

Thankfully, our mind makes things easier for us by using efficient thinking strategies known as heuristics. A heuristic is a mental shortcut that helps us make decisions and judgments quickly without having to spend a lot of time researching and analyzing information.

For example, when walking down the street, you see a piano tied to a rope above the sidewalk. Without a break in stride, you would likely choose to walk around that area instead of directly underneath the piano. Your intuition would tell you that walking under the piano could be dangerous, so you make a snap judgment to walk around the danger zone. You would probably not stop and assess the entire situation or calculate the probability of the piano falling on you or your chances of survival if that happened. You would use a heuristic to make the decision quickly and without using much mental effort.

Most of the time, heuristics are extremely helpful, but they can lead to errors in judgment. There are several different categories or types of heuristics. Let's discuss three that, although useful in many situations, can lead even the most intelligent people to make foolish decisions: availability, representativeness, and base-rate heuristics.

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  • 0:00 Heuristics
  • 1:36 Availability Heuristic
  • 2:46 Representativeness
  • 3:32 Base-Rate Heuristic
  • 4:53 Lesson Summary
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Availability Heuristic

First, the availability heuristic is a mental shortcut which helps us make a decision based on how easy it is to bring something to mind. In other words, we often rely on how easy it is to think of examples when making a decision or judgment.

For instance, in 2011, what percentage of crimes do you suppose involved violence? Most people are likely to guess a high percentage because of all the violent crimes - murder, rape, robbery, and assault - that are highlighted on the news. Yet the FBI reported that violent crimes made up less than 12% of all crimes in the United States in 2011.

The problem with the availability heuristic is that we assume that if several examples are readily available in our mind, the event or subject matter is commonplace. But, as with our example of violent crime, that assumption is not always correct.

However, there are many situations in which the availability heuristic is useful and accurate. For example, it's part of what makes us careful in dangerous situations. If we can think of a similar situation that ended badly for someone else, we are more likely to be cautious and better protect ourselves.

Representativeness Heuristic

Another type of heuristic is a representativeness heuristic, a mental shortcut which helps us make a decision by comparing information to our mental prototypes. For example, if someone was to describe an older woman as warm and caring with a great love of children, most of us would assume that the older woman is a grandmother. She fits our mental representation of a grandmother, so we automatically classify her into that category.

This heuristic, like others, saves us time and energy. We make a snap decision and assumption without thinking very much. Unfortunately, many examples of the representativeness heuristic involve succumbing to stereotypes. We might assume that someone who loves skateboarding is always getting into trouble or that a child dislikes healthy food.

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Additional Activities

Types of Heuristics Writing Activity

Discussion Questions

For this activity, respond to the following discussion questions about the different types of heuristics. For each question, respond with at least 2-3 complete sentences. Note that some questions have multiple components. Make sure to answer all of the parts of these questions, and also keep in mind that some of these questions may require further research.

  1. Compare and contrast the three heuristic types that were described in this lesson. How are they similar? How are they different? Explain.
  2. When can heuristics lead to errors in judgment and foolish decisions? Explain with specific examples.
  3. Give an example of a time when you used a heuristic in your life.
  4. One other type of heuristic that wasn't mentioned in the lesson is called an affect heuristic. Research this type of heuristic and explain what it is. Then, provide an example of a situation when a person might use this type of mental strategy.

A Possible Response to Question #3:

After watching many shark attack movies and shows on TV this past summer, I decided not to go swimming in the ocean while on vacation. This is an example of an availability heuristic because I believed that my chances of being attacked by a shark were high after watching all of those scary shows. However, in reality, the likelihood of being attacked by a shark is remarkably low.

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