What is personal knowledge graph?

Personal knowledge graph is a concept in personal epistemology: Individual atoms of knowledge become powerful when linked into a navigable structure.

Example: You read a book on decision-making and capture twelve ideas. Each idea sits in its own note. A year later, you encounter a problem at work that three of those ideas — from different chapters — would solve if combined. But you do not remember them. They exist in your system, unlinked and invisible. Now imagine those same twelve ideas stored as nodes in a graph, connected to each other by relationships — "contradicts," "supports," "enables" — and connected outward to your notes on psychology, your project retrospectives, your models of team dynamics. When the work problem arises, you search for "decision under uncertainty" and the graph surfaces not just one note, but a cluster of connected concepts, including the three you needed. The ideas were always there. The graph made them findable.

This concept is part of Phase 18 (Knowledge Graphs) in the How to Think curriculum, which builds the epistemic infrastructure for knowledge graphs.