What is post-mortem analysis?

Post-mortem analysis is a concept in personal epistemology: A failure you analyze in writing becomes data. A failure you only remember becomes shame.

Example: You launch a feature that tanks. Two weeks later, someone asks what happened and you say 'the timing was off' — a convenient narrative your brain constructed after the fact. But if you had written a structured analysis the day it happened, you'd have the real list: the user research you skipped, the metric you chose because it was easy to move, the dissenting voice on the team you dismissed. The written version is ugly. It's also the only version that teaches you anything.

This concept is part of Phase 10 (Externalization Mastery) in the How to Think curriculum, which builds the epistemic infrastructure for externalization mastery.