Examples of Psychological Errors
An overview of common cognitive biases and heuristics—such as optimism bias, availability heuristic, hindsight bias, planning fallacy, confirmation bias, and attribution error—that distort human judgment and decision-making.
THE IDEA
Examples of Psychological Errors
Judgments can depend on starting assumptions or “reference points.” The following patterns describe other ways that expectations and context can affect a decision.
Optimism bias. Overestimate the likelihood of desirable events and underestimate the likelihood of undesirable ones.
Availability heuristic. Judge frequency or likelihood by how readily examples come to mind. Recent, vivid, or emotionally charged information may be easy to recall without being representative. “Statistical” thinking is relevant to quality management, including discussions of ISO 9000; a memorable anecdote should be assessed alongside broader evidence.
Hindsight bias. Once an outcome is known, overestimate how predictable it was beforehand. Memories of earlier expectations can be reconstructed in light of the result.
Planning fallacy. Underestimate the time, work, or resources a project will require, especially when focusing on the plan rather than comparable past projects.
Need for closure. Seek an answer quickly to escape uncertainty, sometimes ending the search before important alternatives have been examined.
Rejection of new ideas. Treat an established view as the default interpretation of incoming information and dismiss evidence that would require revising it.
Confirmation bias. Give greater weight to information supporting an existing belief or decision than to information challenging it. This can reinforce the rejection of new ideas.
Self-serving attribution. Credit success to personal ability while attributing failure to external circumstances. The passage attributes this account to Taleb’s Fooled by Randomness: “We humans are victims of asymmetry in the perception of random events. We attribute our successes to our mastery, and failures to external events beyond our control. Namely - randomness. We take responsibility for the good, but not for the bad. This allows us to think that we are better than others - whatever we do.”
Anthropomorphism. Attribute human intentions, emotions, or other characteristics to nonhuman entities.
Attribution error. Underweight situational constraints when explaining another person’s behavior and overweight personal traits. A related actor-observer contrast appears when someone explains their own conduct as a response to circumstances but describes someone else’s as a fixed disposition: “It annoys me when...” versus “He’s a disgusting type”.
Projection. Assume that others share one’s thoughts, feelings, values, or priorities. In a strategic decision, that assumption can obscure how another person or group interprets the same situation.
When to use it
Identifying and mitigating biases during strategic planning sessions in business.
Improving self-awareness in personal decision-making by recognizing overconfidence and confirmation bias.
Designing more objective performance reviews by accounting for hindsight bias and attribution error.
Teaching critical thinking skills in educational settings by exploring common psychological errors.
FROM THEORY TO EVERYDAY LIFE
In practice
Availability Heuristic in Management
A manager makes a hiring decision based on a recent vivid success story of a candidate from a particular school, ignoring broader statistical data about employee performance across schools.
Hindsight Bias in Project Reviews
After a project fails, team members claim they 'knew it all along' and overestimate how predictable the failure was, while ignoring uncertainties present at the start.
A MOMENT TO REFLECT
Put it to work.
Think of a recent decision where you relied on easily recalled information rather than statistical data. How might the availability heuristic have influenced your choice?
Recall a time when you were certain about an outcome after it happened. Did you truly predict it, or is hindsight bias distorting your memory?
When you see someone else fail, do you blame their personality? When you fail, do you blame the situation? How could the attribution error affect your relationships?
References
- Fooled by Randomness — Nassim Nicholas Taleb (2001)
CONTINUE THE CONVERSATION
Source texts
- Thinking in Systems and Mental Models Think Like a Super Thinker (Dawson, Marcus P)