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Duhigg gives us a set of stories about people who have been very productive in various ways and some tips: motivation is about feeling in control, teams work best in a safe space where people have equal time to talk; a mental model can be very helpful if you are flying a plane in severe distress; goal setting should be a mix of stretch goals and SMART actions; managing others works well when you can devolve power to the front line (as in a car factory); decision-making should involve open-mindedness and an understanding of probability; innovation is a bit hard to pin down (no real useful take-aways from the chapter for me); and to get good results (in school or in debt collecting) the key is to experiment and to work with data to understand what experiments have worked.
All this is persuasively written. I'm not sure how far it would go to solve the problem Duhigg says he started with, of not having enough time to fit everything in. But clearly Duhigg thought about this himself (or his editor did, he tells us) and in some ways the most interesting chapter in the book is the last one on applying these ideas. It's persuasive on decision-making, focus and goals - and even motivation to a degree. Less so on the other themes of the book, where the final chapter give you 'how to' advice, rather than worked examples from Duhigg's own life.
I felt overall I learned something from this book. The narratives are all eye-catching and the notes convince you that Duhigg has done his homework on the stories. That said, you might do better to read, say Philip Tetlock's book on super forecasting rather than the chapter here on decision-taking. And I dare say the same is true for some of the other themes of the book. And doubts persist about how far it all fits together as a single coherent study of productivity. It did hold my attention, though, and it is thought-provoking.