Pathwise

People and communication · 12 Lessons

Mental Models: Think Clearly, Decide Better

Twelve reusable ideas that make everyday decisions clearer, each one worked through on a real choice.

For anyone who has to choose a job, a flat, a phone or a plan and wants better reasons than a gut feeling. You'll learn twelve mental models, the common way each one gets misused, and a short routine for the decisions you can't undo. Every model comes with an everyday worked example and practice on a fresh case.

By the end you can

Seeing clearly

Tell a description apart from the thing it describes, rebuild a problem from what is definitely true, and know where your real understanding ends.

  1. The map is not the territory

    CVs, reviews, plans and budgets are all maps: useful simplifications that leave things out. Learn to spot what a map drops and check the ground before a big decision.

  2. First principles

    Break a problem down to what is definitely true and rebuild from there, instead of copying what everyone else does. Learn the four steps and when copying is actually the smarter choice.

  3. Circle of competence

    Feeling sure and actually knowing are different things. Learn to find the edge of what you really understand, and how to decide sensibly when a choice falls outside it.

Thinking in probabilities

Start from how often things like this work out, weigh each outcome by its chance and its size, and follow the effects one step further than everyone else.

  1. Base rates

    Before judging your own case, ask how often things like this work out. Learn to find a base rate, adjust it for your situation, and resist the pull of one vivid story.

  2. Expected value

    Weigh each outcome by how likely it is and how much it's worth. Learn when a long shot is a good bet, when a likely win is a bad one, and why a loss you can't survive changes everything.

  3. Second-order thinking

    Every decision has an immediate effect and then the effects of that effect. Learn to ask 'and then what?', to see how people will react to the incentives you create, and when to stop following the chain.

Traps in your own head

Catch the three biases that quietly pick your evidence for you: looking only for agreement, protecting what you already spent, and seeing only the survivors.

  1. Confirmation bias

    Once you lean one way, your mind starts collecting agreement and skipping the rest. Learn to search for the no, and to answer one question before every big choice: what would change my mind?

  2. Sunk cost

    What you already spent is gone whichever way you choose, so it can't help you choose. Learn to judge the future on its own, and to stop or continue for reasons that are still ahead of you.

  3. Availability and survivorship

    What comes to mind easily isn't what happens often, and the cases you can see are the ones that made it through. Learn to count instead of recall, and to go looking for who is missing from the picture.

Deciding well

Turn the models into a routine: ask how a plan fails, price every yes in what you give up, and build a toolkit you'll actually use on a real decision.

  1. Inversion

    Instead of asking how to succeed, ask what would guarantee failure, then remove it. Learn to turn any goal into a short list of preventable disasters, and to subtract before you add.

  2. Opportunity cost

    The real price of anything is the next best thing you gave up for it, in money and in hours. Learn to ask 'instead of what?' and to see the quiet no inside every yes.

  3. Your decision toolkit

    Turn eleven models into three habits: sort decisions by whether you can undo them, run a premortem before you commit, and keep a three-minute decision journal. Then apply four models to one real case.

Keep it, don't just read it

Pathwise brings each idea back just before you'd forget it, with a quick question. Free on Android and on the web, in English and Persian.

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