What is information architecture?

Example: You reorganize your notes app from topic-first (Psychology > Motivation > Self-determination theory) to project-first (Book Draft > Chapter 3 > Self-determination theory). Nothing was added or removed — only the hierarchy changed. But now self-determination theory appears when you're writing, not when you're browsing. The restructure made 'finishing the book' your top priority, even though you never explicitly said so. Your hierarchy said it for you.

This concept is part of Hierarchy and Nesting in the How to Think curriculum, which builds the epistemic infrastructure for hierarchy and nesting.