# Productivity
All Productivity notes →1 — Learning How to Learn
The meta-skill underneath every technique in this Part: diagnosing what kind of learning a topic actually requires before picking a method for it.
Active Recall
Retrieving information from memory instead of re-reading it — the single highest-leverage substitution in most study routines.
Deliberate Practice
Practicing at the edge of current ability with immediate feedback — the specific structure that separates deliberate practice from mere repetition.
Feynman Technique
Explaining a concept in plain language to find the exact spot understanding breaks down — the gap is the actual study target.
Interleaving
Mixing related topics or problem types in one session instead of blocking them, forcing real discrimination instead of pattern-matching on order.
Spaced Repetition
Reviewing material at increasing intervals timed to the forgetting curve, so review effort concentrates on what's about to be forgotten.
4 — Mental Models
A working library of cross-domain frameworks for reasoning about unfamiliar problems faster — see Philosophy for the dedicated catalog this book draws on.
5 — Reading Technical Books
Reading dense technical material for retention and application rather than page-count completion.
6 — Research Skills
Efficiently going from an unfamiliar topic to a working understanding — source triage, targeted questions, and knowing when to stop reading and start doing.
Learning Journal — Template
Feynman-technique template for deepening understanding after a learning session, with a spaced-repetition follow-up.