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Although the first few chapters are helpful, the sections on retrospective activities are shambolic in the way they're written. Some of them are difficult to understand and I think better proof reading might have helped. I expected more in the way of how to manage retrospectives for different team dynamics, eg new teams, mature teams, problem teams etc. I don't think the book is worth the price.
As a Scrum Trainer and Contract Scrum Master, I regularly look for new ways to enliven Scrum Retrospectives. This book is my start point. It not only contains some fantastic ideas, it sets my mind free to think of alternatives that I can use.
Keeping Sprint Retrospectives engaging and useful is pivotal to helping a Scrum Team to continuously improve. This book will help you do that.