What is build measure learn habits?

Build measure learn habits is a concept in personal epistemology: Start with broad triggers and narrow them as you learn what works.

Example: You want to practice deep breathing when you feel stressed. Your first trigger is 'whenever I feel tense.' That fires dozens of times a day — most of them trivial. After a week, you narrow it: 'when I notice my shoulders rising toward my ears.' After another week, you add a context filter: 'when I notice my shoulders rising during a meeting.' Now the trigger fires 2-3 times a day, exactly when it matters most. You didn't design that precision on day one. You earned it through three rounds of observation and adjustment.

This concept is part of Phase 22 (Trigger Design) in the How to Think curriculum, which builds the epistemic infrastructure for trigger design.