What is tagging system?

Tagging system is a concept in personal epistemology: A tag is the simplest way to declare that two atoms share something in common.

Example: You write a note about how your team's sprint retrospective keeps surfacing the same blockers. You tag it #decision-debt and #team-process. A week later, you write a separate note about how your personal habit of deferring hard conversations maps to the same pattern. You tag it #decision-debt and #avoidance. The tag #decision-debt now connects two atoms from completely different domains — team workflow and personal behavior — without you having to build a folder called 'Patterns of Avoidance Across Contexts.' The relationship declared itself through a shared label.

This concept is part of Phase 2 (Atomicity and Decomposition) in the How to Think curriculum, which builds the epistemic infrastructure for atomicity and decomposition.