First-Principles Thinking
Stop copying the answer. Rebuild it from the ground up.
Reason up from what you know is true instead of by analogy. Learn to boil a problem down to its irreducible facts and rebuild from scratch — the engine behind every real breakthrough.
Most of the time, you don’t actually think — you copy. You reach for whatever the people around you did, whatever worked last time, whatever “everyone knows.” That shortcut is called reasoning by analogy, and it’s fast, cheap, and right often enough that you barely notice you’re doing it.
First-principles thinking is the opposite move: instead of copying the answer, you tear the problem down to the handful of things you know are true — the bedrock facts that can’t be reduced any further — and rebuild a solution from those, ignoring how it’s “always been done.” It’s slower. It’s harder. And it’s the single most reliable way anyone has ever found to reach an answer nobody else could see.
This course assumes you’ve met the idea of a mental model and want a sharper tool for cracking hard problems. By the end you’ll be able to spot when you’re copying, run the “why” ladder down to bedrock, separate a real constraint from an inherited assumption, and — crucially — know when not to bother, because analogy is the right call far more often than the gurus admit.
In this topic
- 1 Why This Course Exists Two people get stuck on the same problem. One copies the usual answer; one rebuilds from what's actually true — and occasionally finds a door nobody else can see. This is the second kind of thinking. 5 min
- 2 Analogy vs. First Principles The core distinction at the heart of first-principles thinking: copying what already works versus rebuilding an answer from the facts you know are true. 12 min
- 3 The 'Why' Ladder: Decomposing to Bedrock The actual technique of first-principles thinking — keep asking 'why is that true?' until you hit bedrock, and learn to catch assumptions wearing a fact costume. 13 min
- 4 The Battery Pack: First Principles in Action Everyone knew battery packs cost about $600/kWh — because they always had. Watch first-principles thinking decompose that 'fact' into raw metals and rebuild it at roughly $80, and learn the recipe behind the gap. 14 min
- 5 When NOT to Use First Principles First-principles thinking is powerful but slow and expensive. Learn when reasoning by analogy is the smarter move, meet Chesterton's fence, and avoid becoming insufferable about the why-ladder. 12 min
- 6 Final Exam: First-Principles Thinking A graded, one-way final exam on first-principles thinking — analogy vs. first principles, the why-ladder, assumptions vs. facts, the battery-pack rebuild, and when NOT to use it. Pass mark 70%. 20 min
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