This is the book that I say to myself “I SHOULD HAVE WRITTEN THAT!!!”. McKeown does a great job in distilling timeless principles like Pareto’s 80/20 Rule as well as newer fundamentals like Theory of Constraints, into a digestible and practicable set of principles that anyone can use in their daily and work life. This book has been out for a while and I continue to see it and the author referenced alongside other books like Checklist Manifesto, 4 Hour Work Week, and other easy reads for entrepreneurs and productivity focused people. I recommend this book for any professional seeking a set of principles by which to focus their work and lives on what’s truly essential (vs. focusing on efficiency - doing the wrong thing super well is a waste!).