Bio
Shane Parrish's core project is making multidisciplinary thinking accessible and practical. Drawing heavily on Charlie Munger's concept of a "latticework of mental models," Parrish has catalogued, explained, and operationalized roughly 100 mental models from physics, biology, mathematics, psychology, economics, and military strategy. His central argument is that most people reason by analogy (copying what others do with minor tweaks), and this produces mediocre outcomes. Superior decision-making requires reasoning from first principles, thinking in second and third-order consequences, and actively inverting problems to identify failure modes before they occur.
Operating themes
- Operating thesis: The quality of your thinking determines the quality of your life; mental models from multiple disciplines give you the latticework to make better decisions and avoid stupidity.
- Mental Model Application
- Decision Framework Selection
- First Principles Thinking
Cards
- The quality of your thinking determines the quality of your life — operate inside your circle of competence — The quality of your thinking determines the quality of your life — operate inside your circle of competence [Tier B]
Sources captured
- 2026-04 —
what-is-first-principles-thinking.md(operator essay archive) - 2026-04 —
second-order-thinking-what-smart-people-use-to-outperform.md(operator essay archive) - 2026-04 —
inversion-the-power-of-avoiding-stupidity.md(operator essay archive) - 2026-04 —
mastering-success-navigating-within-your-circle-of-competence.md(operator essay archive) - 2026-04 —
mental-models-the-best-way-to-make-intelligent-decisions-100-models-explained.md(operator essay archive)