What is building error tolerance?

Building error tolerance is a concept in personal epistemology: No process works perfectly every time — error correction must be built in from the start.

Example: You build a morning routine: wake at 5:30, journal for fifteen minutes, exercise for thirty, review your goals, then start deep work by 7:00. For two weeks, it runs flawlessly. Then your child wakes up sick at 5:15. Then a deadline forces you to skip journaling three days in a row. Then you sleep through the alarm after a late night. Within a month, the routine has silently degraded — not because the design was bad, but because you built it with zero tolerance for the errors that every system inevitably produces. Compare this to the person who designs the same routine with an explicit error budget: if the full routine breaks, a fifteen-minute minimum version exists. If the minimum version breaks two days running, a weekend reset protocol triggers. Same routine. One version shatters on contact with reality. The other absorbs errors and continues functioning.

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