What is testing ideas with others?

Testing ideas with others is a concept in personal epistemology: Explaining your schema to someone else and hearing their objections is a form of validation.

Example: You've built a mental model that says 'senior engineers resist process because they've been burned by bad process.' It feels airtight — until you explain it to a colleague who points out that the senior engineers on her team actively champion process, but only process they helped design. Your schema isn't wrong; it's incomplete. The variable isn't seniority or past trauma — it's ownership. You would never have found that gap alone, because the schema felt complete from the inside.

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