What is tags vs folders?

Tags vs folders is a concept in personal epistemology: Sometimes you need to classify the same items along multiple independent dimensions.

Example: A product manager maintains a backlog of 200 feature requests. She has been organizing them by product area: payments, onboarding, reporting, integrations. It works until a stakeholder asks: 'Which requests came from enterprise customers?' Another asks: 'Which ones affect our compliance posture?' A third: 'Which ones are quick wins versus multi-quarter investments?' Each question demands a different classification of the same 200 items. She cannot answer any of them by looking at her product-area folders. The folder structure forces each request into exactly one category, and the questions cut across that single dimension. She needs cross-cutting categories: product area, customer segment, compliance impact, and effort size, applied independently to the same items. When she builds a spreadsheet with columns for each dimension, the backlog transforms. She can filter for enterprise-requested compliance features that are quick wins — a view that was invisible when her only lens was product area. The items did not change. Her classification infrastructure did.

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.