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The Value of Probabilistic Thinking: Spies, Crime, and Lightning Strikes

Shane Parrish · 14 May 2018

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  1. Probabilistic thinking is essentially trying to estimate, using some tools of math and logic, the likelihood of any specific outcome coming to pass. It is one of the best tools we have to improve the accuracy of our decisions.
  2. The future is far from determined and we can better navigate it by understanding the likelihood of events that could impact us.
  3. Bayesian thinking allows us to use all relevant prior information in making decisions.
  4. Far more probability estimates are wrong on the “over-optimistic” side than the “under-optimistic” side.
  5. Successfully thinking in shades of probability means roughly identifying what matters, coming up with a sense of the odds, doing a check on our assumptions, and then making a decision.

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