Make decisions explicit
Write down the reasoning behind important decisions so that experience can improve a repeatable process.
Perimeter Books
01 02 03 04 
Perimeter Books / Decision-making
Principles: Life & Work
Ray Dalio
Dalio’s account of the principles that shaped his life and his work at Bridgewater.
2017 · 592 pages · Hardcover
Purchase on the bookseller’s site. Availability and cover editions may vary.
Make it part of your reading
10–15 hoursEstimated reading time, at 40–60 pages an hour
Avid Reader Press / Simon & Schuster2017 · selected edition
Explore Ray Dalio ↗Books, writing & collected mentions
Bookseller searches help you choose an edition or format. Availability and prices vary. These links are not affiliate links.
Inside the book
What you’ll find inside.
Ray Dalio turns the lessons of building Bridgewater into a practical system for making decisions. The book moves from personal history to principles for individual life and, finally, the mechanics of running an organization. Its recurring question is how to replace reflex, ego, and guesswork with explicit reasoning that other people can examine. Dalio’s answer combines candid feedback, written rules, and a willingness to give greater weight to people with relevant experience. The result is a detailed management philosophy that invites readers to articulate their own principles and test them against outcomes, including uncomfortable mistakes.
Who it’s for
Founders, managers, and reflective readers who want a structured approach to decisions, feedback, and team culture.
Ideas to examine
Take these into your reading.
Learn from mistakes
Examine painful mistakes closely enough to change the habits or assumptions that produced them.
Invite informed disagreement
Invite informed disagreement and assess the evidence behind an opinion before following its most confident advocate.
Clarify responsibilities
Make responsibilities and expectations explicit so a team can diagnose problems and improve how it works.
Your research notebook
Questions worth keeping.
- Which recurring decision in your life would benefit most from a written principle, and what evidence would make you revise it?
- What would your team need in place for candid disagreement to improve decisions without discouraging people from speaking?
Save this title to add your own notes and reading progress.
The ideas, in conversation
Hear from the author.
Conversations are produced by the linked publishers and may cover the author’s broader work.
Go back to the evidence
Connect the book to your research.
Compare a decision framework with other accounts of incentives, uncertainty, and behavior.
Publication
Collab Fund essays
Essays from Collaborative Fund on investing, human behavior, and business.
Data informed essays about building wealth, understanding market risk and making financial decisions, with charts that connect investing research to everyday choices.
A different way into the subject
Continue the conversation.
Investing
Invest Like the Best
Interviews with investors, founders, and experts · Colossus
Conversations with investors, founders, and specialists about their methods.
Go deeper
Investing
Capital Allocators
Interviews with institutional investment leaders · Capital Allocators
Discussions with investment practitioners about allocating and managing capital.
Go deeper
Keep your reading connected
Read this next.
Decision-making
Poor Charlie’s Almanack
2023 · Abridged hardcover
A collection of Munger’s talks and ideas on judgment, business, and investing.
Go deeper
Decision-making
The Almanack of Naval Ravikant
2020 · 242 pages · Paperback
A collection of Ravikant’s perspectives on wealth, judgment, and happiness.
Go deeper
Investing
The Most Important Thing
2011 · 200 pages · Hardcover
A collection of Marks’s ideas about risk, value, cycles, and investment judgment.
Go deeper