What Are Mental Models?
The thinking tools that travel from one problem to the next.
The root of the whole site. Learn what a mental model is, why a latticework of models beats memorized facts, and the base ideas everything else builds on.
You don’t see the world directly. Nobody does. What you actually carry around is a head full of simplified pictures of how things work — why bread rises, why your friend is grumpy on Mondays, why the cheaper option sometimes costs more. Those pictures are mental models, and this course is about collecting good ones on purpose instead of stumbling into them by accident.
This is the very first stop on the site, so it assumes you know nothing about any of this. By the end you’ll be able to say — precisely — what a mental model is, why carrying many of them beats clutching one, and where each model quietly lies to you. Everything else here builds on these four ideas, so it’s worth getting them solid.
In this topic
- 1 Why This Course Exists A two-minute orientation to mental models — what you'll learn, why a toolkit of thinking tools beats raw facts, and how the rest of the course is laid out. 5 min
- 2 What a Mental Model Is A mental model is a compressed map of how something works. Learn the precise definition with the subway-map analogy, a worked example, the key pitfall, and when to reach for one. 11 min
- 3 The Map Is Not the Territory Every model omits detail — and sometimes the omitted detail is exactly what matters. Learn the map–territory distinction, see detail vanish on an interactive coastline, and learn when the omission bites. 13 min
- 4 The Latticework of Models Why many models beat one. Learn Munger's latticework idea, the 'man with a hammer' problem and the law of the instrument, with worked examples and a map of how models connect across disciplines. 13 min
- 5 Circle of Competence Knowing the edge of what you actually understand. Learn the circle of competence, why the boundary matters more than the size, the overconfidence trap, and how to act inside and outside your circle. 12 min
- 6 Final Exam: What Are Mental Models? A graded, one-way final exam on the foundations of mental models — what a model is, map vs. territory, the latticework, and the circle of competence. Pass mark 70%. 20 min
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