Use-It-or-Lose-It

Use-It-or-Lose-It is Munger's tendency that skills and knowledge decay when they are not practiced. In poor-charlies-almanack, it appears in the psychology checklist as a warning that even valuable mental models become inert if they are not regularly retrieved and applied.

Why It Matters

This connects Munger's mental-models program to the wiki's learning-science cluster. spaced-repetition, retrieval practice, and deliberate-practice are not just study techniques; they are how you keep useful knowledge alive enough to use under pressure.

For the mental-models-latticework, the implication is practical: a checklist, review ritual, or decision journal is not bureaucracy. It is maintenance for cognition.

Sources

• poor-charlies-almanack - Psychology of human misjudgment and Munger's mental-models practice discipline.