What is iterative validation?

Iterative validation is a concept in personal epistemology: Schemas need ongoing testing because the world they model keeps changing.

Example: You validated your schema about remote work — 'distributed teams produce better code because they have fewer interruptions' — two years ago when your team was five people across two time zones. The schema felt solid. But your team is now twenty people across eight time zones, and the same schema produces coordination failures, missed handoffs, and declining code quality. The schema wasn't wrong when you tested it. The world changed, and the schema didn't keep up.

This concept is part of Phase 15 (Schema Validation) in the How to Think curriculum, which builds the epistemic infrastructure for schema validation.