Prerequisites

What You Need Before Starting

Required

  • Intellectual honesty — The willingness to consider that things you currently believe might be wrong.
  • Comfort with ambiguity — This book often lands on "it's complicated" rather than a clean answer. That's deliberate.
  • Curiosity about your own field — You'll get the most from this book if you're willing to turn its tools on your own domain of expertise.

Not Required

  • No specific academic background. Examples are drawn from dozens of fields and explained from scratch. Whether you're a physician, programmer, policy analyst, teacher, investor, or curious reader — the patterns are the same.
  • No statistics or mathematics. Some chapters touch on statistical concepts (replication, p-values, precision vs. accuracy), but everything is presented intuitively with concrete numbers and examples. You will never need to solve an equation.
  • No philosophy background. This book references epistemology, philosophy of science, and thinkers like Kuhn and Popper, but it explains everything it uses. No prior reading in philosophy is assumed.

Helpful But Not Required

  • 5+ years working in any field. If you've worked in a specific domain for a while, every chapter will land harder. You'll recognize the patterns from your own experience. But this is enhancement, not requirement — students and early-career readers have found the material equally valuable.
  • Having read The View From Everywhere. This book's companion volume covers cross-domain patterns in knowledge. Reading it first provides useful context, but this book stands completely on its own.

Self-Assessment: Are You Ready?

Try answering these questions honestly. There are no right answers — they're designed to surface your starting assumptions.

  1. Think of a belief that is widely held in your field. What evidence would you need to see before you abandoned it? Be specific.

  2. Can you name a time when the expert consensus in any field turned out to be wrong? What does that tell you about current expert consensus?

  3. If a colleague you respected told you that a foundational assumption in your field was incorrect, what would your first reaction be? Curiosity? Defense? Dismissal?

  4. On a scale of 1–10, how confident are you that the things you learned in school (or in professional training) are correct? Now: how confident should you be?

  5. Have you ever changed your mind about something important because of evidence? What did that feel like?

If these questions made you uncomfortable — good. That discomfort is the starting material for this entire book. Welcome.