The Affect Heuristic: How Feelings Become Facts About Risk
Paul Slovic found that people who feel positively about nuclear power judge its risks as low and its benefits as high.
December 2024
Understanding Social Comparison Theory and Its Effects
Olympic silver medalists look less happy than bronze medalists at the moment of winning. The silver medalist compares upward — to gold, which they...
Psychological Reactance: Why Bans Backfire
In 1975, Stephen Worchel put two cookies in one jar and ten in another, then told subjects the scarce jar was limited due to demand.
What Is the Planning Fallacy and Why Projects Always Run
The planning fallacy is the tendency to underestimate how long projects will take despite knowing that similar projects ran over. Learn the science, the inside view trap, and reference class forecasting.
The IKEA Effect: Why We Overvalue What We Build Ourselves
Norton, Mochon, and Ariely asked subjects to assemble IKEA boxes, then bid on them in an auction alongside identical expert-assembled boxes.
Ego Depletion: Is Willpower a Limited Resource?
The radish-and-cookies study launched a willpower theory that now faces a replication crisis.
The Decoy Effect: How Choices Influence Your Decisions
The Economist offered three subscription options: digital-only for $59, print-only for $125, and print-plus-digital for $125.
What Is Motivation? Understanding Its Psychological Forces
Motivation is the psychological force that initiates, directs, and sustains behavior toward goals, driven by a combination of intrinsic and...
Minority Influence: How Small Groups Shift Majorities
Minority Influence research shows how consistent, committed minorities can change the attitudes of majorities — often through deeper, more lasting...
Cognitive Load Theory: The Limits of Memory
George Miller's 1956 paper established that working memory holds 7 ± 2 items. John Sweller's 1988 cognitive load theory asked: if working memory is...
Choice Architecture: Designing Decisions for Impact
When Brian Wansink rearranged a school cafeteria — putting fruit at eye level and making desserts harder to reach — fruit consumption increased by...
Attribution Theory: Misunderstanding Actions
In 1967, Jones and Harris had subjects read essays supporting Fidel Castro's Cuba. Even when subjects were explicitly told the writers had been...
What Is Social Proof and How It Drives Behavior
What is social proof? Cialdini's influence principle, the Asch conformity experiments, how online reviews work, pluralistic ignorance, when social proof backfires, and dark patterns.
The Pygmalion Effect: Expectations and Their Impact
In 1968, Robert Rosenthal and Lenore Jacobson told teachers at a San Francisco elementary school that certain students — randomly selected — had...
What Is the Peak-End Rule: Why Endings Define Experiences
The peak-end rule shows that people judge experiences by their peak moment and ending, not their average. Learn the research and how to design better experiences.
The Mere Exposure Effect: Why Familiarity Breeds Liking
In 1968, Robert Zajonc exposed subjects to nonsense words, Chinese characters, and photographs of faces at varying frequencies.
The Just-World Hypothesis: Understanding Victim Blame
In the mid-1960s, Melvin Lerner showed subjects an innocent woman receiving electric shocks. Unable to stop the shocks, observers began to derogate her —...
The False Consensus Effect: Misjudging Social Norms
In 1977, Lee Ross asked Stanford students whether they would walk around campus wearing a sandwich board reading 'Eat at Joe's.' Those who agreed...
The Zeigarnik Effect: Why Unfinished Tasks Haunt the Mind
In a Vienna café in the 1920s, Kurt Lewin noticed that waiters remembered unpaid tabs in perfect detail but forgot settled ones immediately.
Understanding Cognitive Bias: Irrational Judgments
Cognitive biases are systematic errors in thinking that cause people to make irrational judgments, often without realizing it, affecting decisions...
Locus of Control: Rotter's Framework on Who Controls Your Life
Locus of Control measures whether people believe outcomes are controlled by their own actions (internal) or by external forces like fate, luck, or...
The Self-Serving Bias: Taking Credit, Avoiding Blame
In 1964, Johnson, Feigenbaum, and Weiby gave teachers feedback on a student's performance. When the student improved, teachers attributed it to...
The Placebo Effect: How Expectation Becomes Physiology
In 1955, Henry Beecher analyzed 15 clinical trials and found that 35.2% of patients responded to inert treatments.
Moral Licensing: How Good Deeds Allow Bad Behavior
In 2001, Benoît Monin and Dale Miller at Stanford showed that subjects who had the opportunity to establish moral credentials — by disagreeing...
DevOps: Blending Development and Operations for Success
DevOps combines development and operations into a unified culture using CI/CD, automation, and feedback loops to ship software faster and more...
Hyperbolic Discounting: Why the Present Always Wins
Richard Thaler found that people prefer $15 now over $20 in a month — but are indifferent between $15 in a year and $20 in 13 months.
Understanding Cloud Computing: Key Concepts and Operations
Cloud computing delivers on-demand IT resources over the internet. Learn how IaaS, PaaS, and SaaS differ, how virtualization works, and which...
Illusory Correlation: Patterns that Mislead Our Minds
In 1967, Loren Chapman showed clinical psychologists Draw-a-Person test responses and patient diagnoses.
Hindsight Bias Explained
Hindsight bias is the tendency to believe after an event that you predicted it all along. Learn the psychology, research, and real-world consequences.
The Representativeness Heuristic: Judging by Appearances
Linda is 31, outspoken, a philosophy major, passionate about social justice. Is she more likely to be a bank teller, or a bank teller active in the...
The Negativity Bias: Why Bad Is Stronger Than Good
John Gottman's lab found that marriages headed for divorce had a ratio of positive to negative interactions of about 0.8:1.
What Is the Status Quo Bias
Status quo bias is our tendency to prefer the current state of affairs over change. Learn about Samuelson and Zeckhauser's research, loss aversion, and how to overcome it.