On the Cover

Thank you to my two artists, Jeniffer Kohnke and Angela Brooks. Jennifer is responsible for the stunning and creative pictures at the start of each chapter and also for the portraits of Kent Beck, Ward Cunningham, Bjarne Stroustrup, Ron Jeffries, Grady Booch, Dave Thomas, Michael Feathers, and myself.

Angela is responsible for the clever pictures that adorn the innards of each chapter. She has done quite a few pictures for me over the years, including many of the inside pictures in Agile Software Develpment: Principles, Patterns, and Practices. She is also my firstborn in whom I am well pleased.

A special thanks goes out to my reviewers Bob Bogetti, George Bullock, Jeffrey Overbey, and especially Matt Heusser. They were brutal. They were cruel. They were relentless. They pushed me hard to make necessary improvements.