Café Rimon

Café Rimon is presented as more than a place to eat: it is the setting in which Daniel Kahneman and Amos Tversky gave their emerging intellectual partnership a concrete direction. At this Jerusalem gathering place, an argument about intuitive statistics became a research plan, and a favorite hangout of bohemians and professors became the site of a decisive transition from conversation to collaborative inquiry.

Setting and Identity

Café Rimon is described as a favorite hangout of bohemians and professors in Jerusalem. That social identity matters because the café stands at the intersection of informal sociability and serious intellectual work. It is neither a university seminar room nor a private office. The movement from the classroom to the café changes the atmosphere without changing the intensity of thought: ideas tested in public debate can be reconsidered over lunch, in a setting associated with both academic life and bohemian culture.

The café therefore functions as a recognizable intellectual meeting place rather than as a richly physical landscape. Its significance comes from the people who use it and from the decisions made there. The text gives the location a compact but memorable role in the history of the collaboration between Daniel Kahneman and Amos Tversky.

The Research Plan

The decisive visit to Café Rimon followed a seminar at the Hebrew University of Jerusalem in 1969. Amos Tversky had spoken to Daniel Kahneman’s class about an ongoing program of research at the University of Michigan investigating whether people were good intuitive statisticians. The seminar produced a lively dispute: the two psychologists initially considered a qualified yes, but ultimately judged that a qualified no was more accurate.

The exchange did not end when the seminar ended. Daniel Kahneman and Amos Tversky enjoyed the argument and recognized that intuitive statistics offered an interesting subject for joint study. That Friday, they met for lunch at Café Rimon and planned a study of the statistical intuitions of sophisticated researchers. The café is consequently linked to a specific intellectual action: it was where a broad question about human reasoning became a defined empirical project.

The planned study was also self-critical. Both researchers acknowledged that their own intuitions were deficient despite years of teaching and using statistics. They lacked an intuitive sense of how unreliable statistical results could be when based on small samples, were too ready to believe findings supported by inadequate evidence, and tended to collect too few observations in their own research. Their purpose was to determine whether other researchers suffered from the same weakness.

From Conversation to Evidence

The project conceived at Café Rimon produced a survey containing realistic scenarios involving statistical problems that arise in research. Amos Tversky collected responses from expert participants at a meeting of the Society of Mathematical Psychology, including the authors of two statistical textbooks. The results confirmed the concern that had prompted the lunch discussion: the experts greatly exaggerated the likelihood that an experimental result based on a small sample would be successfully replicated and gave poor advice to a fictitious graduate student about how many observations to collect.

The findings sharpened the irony of the location’s role. A café associated with professors and intellectual conversation became the birthplace of research showing that even expert conversation about statistics could be misleading. Expertise did not automatically produce sound intuitive judgment. The conclusion was not merely that untrained people make mistakes; even statisticians were not good intuitive statisticians.

Collaboration and Lasting Significance

While writing the article reporting the findings, Daniel Kahneman and Amos Tversky discovered that they enjoyed working together. Their collaboration combined sustained effort with continuous amusement, and the pleasure of working together made them unusually patient in pursuing perfection. They also suspended their usual argumentative defensiveness: neither rejected the other’s ideas out of hand, and Amos Tversky often clarified the point of Daniel Kahneman’s vague ideas more clearly than Kahneman himself could.

Café Rimon thus marks the beginning of a productive intellectual relationship rather than a complete episode in itself. The lunch initiated a line of inquiry into statistical intuition, small samples, replication, and expert judgment that became part of the wider study of judgment and decision making. Its narrative importance lies in the contrast between the apparent informality of the meeting and the scale of its consequences: an ordinary lunch at a Jerusalem café helped set in motion a collaboration whose investigations exposed systematic weaknesses in human reasoning.

The location also resonates with later themes in the book. Research discussed elsewhere examines how experts forecast political and economic events, how financial officers overestimate their predictive ability, and how subjective probability intervals become too narrow because of anchoring. The café scene supplies the human origin point for this larger intellectual preoccupation. Before statistical judgment was measured in surveys, prediction records, confidence intervals, or national well-being studies, it was questioned in conversation by two researchers willing to include themselves among the fallible subjects.