The Great Mental Models
The Great Mental Models, the opening volume in a multivolume project from the Farnam Street team led by Shane Parrish, is less a business book than a tool kit. It introduces nine foundational thinking tools borrowed from across disciplines, among them the map and the territory, circle of competence, first principles thinking, thought experiments, inversion, and Occam's razor, and shows with case studies, historical examples, and hand-drawn diagrams how each one can be used to cut through confusion. The argument is that better decision-making is less about raw intelligence than about having a small set of reliable mental scaffolds to hang a problem on. Conversational and careful, the book functions well as a reference to pick up and put down rather than a start-to-finish read.
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Shane Parrish and Rhiannon Beaubien collect a working set of mental models drawn from physics, biology, mathematics, engineering, and the humanities. Each chapter walks through one model, like inversion or second-order thinking, with examples from history, business, and everyday decisions.
The Great Mental Models was written by Shane Parrish (founder of Farnam Street) with Rhiannon Beaubien and originally published in 2019. It is a multi-volume series catalog of cognitive frameworks for decision-making.
Shane Parrish has published four volumes: General Thinking Concepts (Volume 1), Physics, Chemistry, and Biology (Volume 2), Systems and Mathematics (Volume 3), and Economics and Art (Volume 4). The series is considered complete.
The Great Mental Models is 190 pages in standard print editions, though page counts vary slightly between hardcover, paperback, and large-print formats.
At an average reading pace of about 250 words per minute, The Great Mental Models takes most readers 3 to 4 hours to finish.
The Great Mental Models is a standalone novel by Farnam Street, not part of a series.
The Great Mental Models is available in hardcover, paperback, ebook, and audiobook formats from Amazon, Bookshop.org, ThriftBooks, and most major bookstores.
