This book challenged me more than any other book I've written. I felt that I needed to bolster my opinions with those of other respected programmers and consultants. I asked for many opinions, and published some of the responses. Thanks to Mike Clark, Matt Raible, Andrew Hunt, Ramnivas Laddad, Brett McLaughlin, and Eitan Suez for answering my questions. Thanks especially to Glenn Vanderburg, Ted Neward, Erik Hatcher, Justin Gehtland, James Duncan Davidson, Jim Weirich, Jamis Buck, David Heinemeier Hansson, Dion Almaer, Jason Hunter, Richard Monson-Haefel, Stuart Halloway, and Dennis Sosnoski for agreeing to let me post your interviews in the book. Thanks again to Justin Gehtland for use.