Superforecasting

What is this book about?

Based on a government-funded forecasting tournament, Tetlock compares the long-run accuracy of experts against amateurs and finds a small group of "superforecasters" who consistently beat intelligence analysts and markets. What he describes is not a gift but a trainable set of habits: thinking in probabilities, updating in small increments, and breaking big questions into judgeable parts.

Why read it?

It turns forecasting from an expression of opinion into a scorable skill, then describes how to raise the score. For anyone who must place bets under uncertainty, its discipline of calibration and updating is worth more than any particular macro call.

Core Ideas

• Forecasts should be stated as probabilities, since only scorable forecasts can be improved.
• Accuracy comes from frequent small updates rather than one firm judgment — those willing to revise often tend to be more accurate.
• The edge of superforecasters lies in how they think — actively seeking disconfirming evidence, separating tractable questions from intractable ones — not in privileged information.
• Recognizing that some questions are inherently unpredictable is itself part of forecasting skill.

What questions does this book try to answer?

• In an uncertain world, what forecasting practices actually improve accuracy?
• Why do expert judgments often underperform a group of well-trained amateurs?

Who should read it?

For analysts, investors, policy researchers, and anyone accountable for their judgments; basic probabilistic intuition makes the reading smoother.