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I knew that if I started to play with computers, I'd get sucked into it. It has been inspirational. He currently provides worldwide training and mentoring in Test-Driven Development (TDD), Refactoring, OO Design, Java, C#, C++, and Extreme Programming (XP). Read Michael Feathers' 12-page PDF, written 2 years before the book. 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Get more out of your legacy systems: more performance, functionality, reliability, and manageability. 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