What is PKM system?

PKM system is a concept in personal epistemology: You need capture tools available in every context where you think — desk, commute, shower, conversation, bed. A gap in coverage is a gap in your thinking.

Example: You solve a thorny architecture problem in the shower, but your phone is in the bedroom and your notebook is downstairs. By the time you towel off and find something to write with, the specific connection that made the solution work has degraded into a vague sense that you 'had something good.' You didn't fail at thinking. You failed at tool placement. The insight was real. Your environment wasn't ready for it.

This concept is part of Phase 3 (Capture Systems) in the How to Think curriculum, which builds the epistemic infrastructure for capture systems.