What is early error detection?

Early error detection is a concept in personal epistemology: Design systems that surface errors early when they are easiest and cheapest to correct.

Example: You spend six months writing a book before showing it to anyone. When you finally share the manuscript, three beta readers independently tell you the central premise is flawed — the argument you built 80,000 words around does not hold up under scrutiny. Six months of work, structured around a foundation nobody tested. Compare this to a writer who drafts a two-page outline of the core argument, shares it with five people in week one, discovers the premise needs restructuring, and pivots before writing a single chapter. Same book. Same ambition. One writer spent six months building on an untested foundation. The other spent two days testing the foundation before building on it. The second writer failed faster, failed cheaper, and ended up with a stronger book.

This concept is part of Phase 25 (Error Correction) in the How to Think curriculum, which builds the epistemic infrastructure for error correction.