Thinking clearly
Reasoning tools for cutting through noise, assumptions and received wisdom to what is actually true.
Clear thinking is mostly the removal of error. First-principles thinking rebuilds an idea from what you truly know; Occam’s razor and Hanlon’s razor cut away needless complexity and malice; "the map is not the territory" reminds you the model is not the world. This is the toolkit for seeing straight.
Key ideas here: First-principles thinking, Occam’s razor, The map is not the territory, Hanlon’s razor, Chesterton's fence — and 5 more below.
Mental models
First-principles thinking
First-principles thinking is breaking a problem down to its most basic, undeniable truths and reasoning up from there — rather than reasoning by…
Occam’s razor
Occam’s razor is the principle that, among competing explanations, the one requiring the fewest assumptions is usually the best place to start.…
The map is not the territory
“The map is not the territory” means any model, description, or belief is a simplified representation of reality — never reality itself. Maps are…
Hanlon’s razor
Hanlon’s razor says: never attribute to malice that which is adequately explained by stupidity, carelessness, or circumstance. Most harm done to you…
Chesterton's fence
Chesterton's fence is the principle that you should not remove or change something until you understand why it was put there in the first place. If a…
Signal vs noise
The signal-to-noise model distinguishes meaningful information (signal) from random, irrelevant fluctuation (noise). Most data is mostly noise, and…
Via negativa
Via negativa is the principle that improvement often comes from removing the harmful, false, or unnecessary rather than adding something new. Knowing…
Second-order thinking
Second-order thinking is considering not just the immediate result of a decision but the consequences of those consequences — the “and then what?”…
Streetlight effect
The streetlight effect is searching for answers where it’s easiest to look rather than where the answer actually is. It’s named for the drunk who…
Circle of competence
Your circle of competence is the set of areas where you genuinely have expertise. The model says: know its boundary, operate inside it, and be honest…
Related topics
The books behind better thinking
Listen to any of these free. Start a free Audible trial and get your first audiobook on the house.
Prefer to read? The canonical picks:
- Thinking, Fast and Slow — Daniel Kahneman
- The Art of Thinking Clearly — Rolf Dobelli
- The Great Mental Models, Volume 1 — Shane Parrish
- Poor Charlie’s Almanack — Charlie Munger
- Super Thinking — Gabriel Weinberg & Lauren McCann
- Seeking Wisdom — Peter Bevelin
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Editorial synthesis © ReadGlobe. Each idea links to a full reference page with sources.