A reading guide 5 articles
Mental Models
Pick a model for the question in front of you. Different models help you examine different parts of the same problem.
A collection of mental models is more useful as a set of questions than as a list to memorize. First principles asks which requirements actually hold. Inversion asks what would make a plan fail. Second-order thinking follows what may happen after the immediate result. A circle of competence asks whether your knowledge is strong enough for the judgment you are making.
Start with the overview to compare these uses, then choose one detailed article. The reading routes below distinguish rebuilding an explanation from anticipating consequences; the complete collection also covers failure prevention and the limits of expertise. Try one model on a small, specific decision. Record what it brings into view, what it leaves out, and which assumption still needs evidence. A clearer question is a useful result even when the model does not supply a confident answer.
Choose a starting point
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Compare the available lenses
Use the overview to match a model to the question you are trying to answer.
Mental Models: Lessons From John Snow and Cholera -
Rebuild from requirements
Separate necessary conditions from conventions before proposing a different approach.
First Principles Thinking: How the Shipping Box Was Born -
Look beyond the first result
Follow possible reactions and later consequences without treating every scenario as a prediction.
Second-Order Thinking: The Day-Care Fine That Backfired
All articles
5 in this collectionCircle of Competence: What Michael Jordan's .202 Shows
Circle of competence through Michael Jordan's 1994 baseball season: why skill is task-specific, how to find your boundary, and how to expand it with feedback.
First Principles Thinking: How the Shipping Box Was Born
First principles thinking through Malcom McLean's shipping container: separating requirements from habits, a six-step rebuild, and where the method misleads.
Inversion Mental Model: Munger's Guide to Misery
The inversion mental model through Charlie Munger's 1986 "guaranteed misery" speech: why thinking backward finds risks, how to run a premortem, and a worksheet.
Mental Models: Lessons From John Snow and Cholera
Mental models through John Snow's 1854 cholera investigation: why two models can fit the same facts, how to find where they disagree, and an index by task.
Second-Order Thinking: The Day-Care Fine That Backfired
Second-order thinking through the Haifa day-care fine that made parents later: first vs second-order effects, where surprises hide, and a worksheet to copy.
Before you read
Which mental model should I learn first?
Choose one that matches a current problem. First principles suits questionable assumptions; inversion helps with preventable failure; second-order thinking helps when reactions and later effects matter. The overview gives a starting map.
Should I apply several models to every decision?
Only when another model answers a question the first one leaves open. Adding models can add work without adding clarity. Start with one, then add another if it changes what you would investigate or do.
How do I know when a model is being stretched too far?
Check whether its assumptions fit the situation and whether its conclusion depends on facts you do not have. A model can organize your thinking; it cannot replace missing evidence or specialist knowledge.