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I already knew quite a lot about Scrum, but it was an interesting short read nonetheless. I forgot some things I learned years ago, and this book served both as reminder and gave me a few new ideas to try. I was surprised to learn Scrum was inspired by Lean, including waste elimination, reducing WIP, all that.
The book is a bit overpromising, though, and doesn't mention challenges or overcoming them. It's mostly about selling the idea than about any advanced implementation.