This second edition reflects the help and advice of many people. We are particularly indebted to Bjarne Stroustrup and Andrew Koenig for their inspiration and advice over the years. Paul Abrahams, Michael Ball, Ian Long, John Kwan, Jason Pritchard, Christopher Van Wyk, and Steve Vinoski were particularly helpful in the development of this edition. We appreciate the support and insights of our colleagues and associates, including Mathew Denman, Mike Ferretti, Peter Jakab, Charles Martin, Robert Martin, Chris Rooney, Dave Stott, Ioannis Tollis, John Vlissides, Jim Watson, Claudia Woody, Demetrios Yannokopoulos, and Howard Young. Debbie Lafferty was a tremendous supporter during both editions of this book, and we will always be grateful for her help and patience. Special thanks from Marshall to David W. Bray for showing me the realities of self-directed thinking, to Doug Lea for daily email at 5:30 A.M.(you get a A++), to Jamshid Afshur, Jr. for a million and one suggestions via email, and to my colleagues at Clarkson University. Thanks to all of my students and the many wonderful supporters of the electronic FAQ. Most of al, thank you to Mary Elaine and to David, Elizabeth, Gabrielle, Peter, Katherine, and Brandon; you make it worth the trouble. Special thanks from Greg to Brian Unger and Graham Birtwistle for introducing me to Simula 67 and object-oriented programming in 1981, long before it became fashionable. Thank you Brian Unger and Marshall Cline for giving me the opportunity to pursue interesting projects in stimulating work environments. Also, thanks to my colleagues from the University of Calgary, Jade Simulations, Paradigm Shift, Inc., and MT Systems Company for their assistance and support over the years. Thank you, Barb, for all of your support and for putting up with my unusual work arrangements and bizarre schedules. Special thanks from Mike to Dix Pettey for showing me what research is all about, to John Schmidt for teaching me to be practical, and to Len Gollobin for showing me how to look at problems the right way. The University of Missouri Mathematics Department will always occupy a special place in my heart for both personal and professional reasons. Thanks to my children, Beverly and James, for putting up with a father whose efforts have not always matched his intentions, and to my special friends Christian, Kelly, and Tamie for being part of my life.