Decision Science & Cognitive Tools
Decision science
you can play.
Interactive experiments and decision frameworks that stress-test how you think and expose your cognitive blind spots.
7
Simulators
Interactive brain experiments
16
Archetypes
Cognitive thinking profiles
3
Decision tools
Frameworks for clearer thinking
100%
Free & Open
Accessible decision science
Interactive Simulations
Interactive
Experiments
Simulators designed to break your brain and rebuild it better.
The Veil of Ignorance
Design a society, then spin the wheel to see who you are born as. Will you survive your own rules?
Play
Cognitive Bias Scanner
Discover which cognitive biases control your thinking. Get your Rationality Score.
Play
The Paradox Game
Work through 5 mind-bending paradoxes. Each one teaches a mental model.
Play
Thinking Style Assessment
56 quick statements, about 8 minutes. See where you fall on 8 dimensions of how you think.
Take the Test
Decision Matrix
List your options, weight what matters, score each one, and see which wins and why.
Use Tool
Coin Flip Decision Maker
Can't decide? Flip a coin, then pay attention to how you feel when it lands.
Use Tool
Intellectual Deep Dives
Featured
Insights
Counter-intuitive takes on how decisions actually get made.
Mental Models7 min read
The Inversion Mental Model: Solve Hard Problems by Working Backwards
Instead of asking how to succeed, ask what would guarantee failure, then avoid it. Where inversion comes from (Jacobi, Munger, Wald's bombers), the research on premortems and subtraction, and how to use it on your next decision.
Read
Mental Models8 min read
The Circle of Competence: Why Smart People Fail Outside Their Field
Linus Pauling won two Nobel Prizes and still went badly wrong on vitamin C. The circle of competence explains why expertise doesn't transfer, why the edge of your knowledge is so hard to see, and how to find it.
Read
Mental Models10 min read
Charlie Munger's Mental Models, Explained
Munger's "latticework" of mental models: inversion, circle of competence, incentives, opportunity cost, margin of safety and the Lollapalooza effect. Where each comes from, what the research says, and how to use them on ordinary decisions.
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