Psychology › Thinking, memory & biases › Heuristics and biases
Daniel Kahneman and Amos Tversky
Together 1969–1996; Nobel 2002· Psychologist or thinker
Well replicatedStrong, repeated evidence.
Two Israeli psychologists whose partnership mapped the predictable errors in human judgment and helped create behavioral economics.
See it on the Psychology map →What it says
Daniel Kahneman (1934–2024) and Amos Tversky (1937–1996) began working together at the Hebrew University of Jerusalem in 1969, often writing side by side in one room, trading drafts and jokes. Their 1974 Science paper on heuristics and 1979 prospect theory are among the most cited works in social science. Tversky died of cancer in 1996. Kahneman received the 2002 economics Nobel, which is not awarded posthumously, and wrote the bestseller Thinking, Fast and Slow (2011).
Why it matters
They showed that human errors are systematic, not random, which gave economists a way to model real behavior and launched a field.
Legacy and how the work held up
Well replicated core findings. Their papers, Kahneman's Nobel lecture and Michael Lewis's The Undoing Project (2016) document the work. Kahneman conceded in 2017 that his book's priming chapter relied on weak studies.
Open questions
How credit splits between them is unknowable: they said they often could not tell whose idea was whose, and Tversky died before the Nobel.
Connections (3)
▸Heuristics and biases was pioneered by Daniel Kahneman and Amos TverskyWell replicated
The connection
The program began in 1969, when Kahneman challenged Tversky's seminar claim that people are fairly good intuitive statisticians. Their first joint paper (1971) showed even trained researchers trust small samples too much; their 1974 Science article set out the shortcuts and the errors they produce.
Who showed it and when
Hebrew University of Jerusalem from 1969, with a 1971–72 stay at the Oregon Research Institute in Eugene.
The evidence
Their jointly written papers, Kahneman's Nobel autobiography, and Michael Lewis's 2016 history, The Undoing Project.
Open questions
Earlier researchers such as Paul Meehl and Ward Edwards studied judgment errors too; how much the program was new versus newly framed is debated.
▸Availability heuristic was identified by Daniel Kahneman and Amos TverskyWell replicated
The connection
Tversky and Kahneman spotted availability while studying how people estimate frequencies. They designed simple tests, such as the letter-position question and lists mixing famous and less famous names, showing people judge frequency by how easily examples come to mind.
Who showed it and when
Hebrew University and the Oregon Research Institute, early 1970s; published in Cognitive Psychology in 1973.
The evidence
The 1973 paper reports the experiments; Kahneman's memoir and Lewis's The Undoing Project describe how the idea arose.
Open questions
A 1998 repeat of the letter-position task found weaker, inconsistent bias, so some original demonstrations are less solid than the concept itself.
▸Daniel Kahneman and Amos Tversky developed Prospect theoryWell replicated
The connection
From about 1974 the pair spent five years testing choices between gambles on students and colleagues, writing and rewriting together. They chose the deliberately meaningless name 'prospect theory' so it would stand out, and published in the economics journal Econometrica so it would reach economists directly.
Who showed it and when
Hebrew University of Jerusalem and Stanford, 1974–1979; Econometrica, March 1979; the cumulative version followed in 1992.
The evidence
The 1979 paper itself, Kahneman's Nobel autobiography on how it was written, and the 2002 Nobel announcement naming prospect theory.
Open questions
Whether its parts, especially the overweighting of small probabilities, belong in standard economic models remains debated among economists.