What is typed thinking?

Typed thinking is a concept in personal epistemology: Assigning types to objects restricts what operations make sense on them.

Example: You have a field in your project tracker labeled 'priority.' Without a type constraint, someone enters 'high,' another enters '1,' a third enters 'ASAP,' and a fourth enters the color red. The field becomes useless — not because people are careless, but because unconstrained fields accept anything, including nonsense. Add a type (e.g., enum: critical | high | medium | low) and the field rejects invalid inputs before they pollute your system.

This concept is part of Phase 12 (Classification and Typing) in the How to Think curriculum, which builds the epistemic infrastructure for classification and typing.