Superforecasting

The Art and Science of Prediction

Philip E. Tetlock and Dan Gardner · 2015 · Psychology

9 min · 11 chaptersNarrated in your voice

Original summary · AI-drafted, human-published · added by Library

What it's about

Tetlock and Gardner draw on the multi-year Good Judgment Project to show that accurate forecasting of world events is a learnable skill, not a gift. A small group of ordinary volunteers, using specific habits of thought, consistently outpredicted intelligence analysts with classified data. The book argues that how you think matters more than credentials, and that measuring forecasters' accuracy against real outcomes should replace our tolerance for vague, unaccountable punditry.

Reading plan

Pick a finish date and Genius lays out the days — the plan shows today's target and keeps you honest.

Read together

Start a circle and share the code — everyone sees everyone's honest place in the book. Accountability, not leaderboards.

Who it's for

- Analysts, strategists, and executives who must make judgment calls under uncertainty - Readers skeptical of pundits and curious what actually separates good predictions from lucky guesses - Anyone who wants a concrete method for updating beliefs as new evidence arrives

What’s inside

1
The Problem With Experts
Fame and confidence in TV pundits are inversely related to their actual predictive accuracy.
1 min
2
The Good Judgment Project as Proof
A four-year open tournament, not intuition or theory, is the book's real evidence that forecasting skill exists and can be measured.
1 min
3
Breaking Questions Into Fermi Estimates
Good forecasters decompose an unanswerable question into smaller, answerable ones rather than guessing at the whole.
1 min
4
Starting With the Outside View
Anchoring a forecast on the base rate of similar past cases, before considering the specifics of the situation in front of you, produces more accurate estimates than starting with the specifics.
1 min
5
Thinking in Granular Probabilities
Precision in probability estimates, not just direction, is itself a skill that separates good forecasters from average ones.
1 min
6
Updating in Small Steps
Frequent, small belief updates as new evidence trickles in produce better long-run accuracy than infrequent, large revisions.
1 min
7
Teams, Aggregation, and the Wisdom of Crowds
Well-structured collaboration among diverse forecasters beats even skilled individuals working alone.
1 min
8
The Temperament of a Superforecaster
Accurate forecasting depends more on a specific cluster of intellectual habits than on raw intelligence or subject expertise.
1 min
9
Where the Argument Strains
1 min
10
Final summary
1 min
11
Actionable advice
1 min

About Philip E. Tetlock and Dan Gardner

Philip E. Tetlock is a psychologist at the University of Pennsylvania who ran the decades-long Expert Political Judgment study and co-founded the Good Judgment Project. Dan Gardner is a journalist and author specializing in risk and decision-making. Together they translate Tetlock's research into a practical account of forecasting skill.