I gratefully acknowledge the reviewers of earlier drafts of the manuscript for their constructive comments—in particular, Alan W. Brown, Jeffrey Hammond, Stephen Mellor, James Dean Palmer, and Rob Pettit.

I am also grateful to the students in my software design and reusable software architecture courses at George Mason University for their enthusiasm, dedication, and valuable feedback. Thanks are also due to Hurley Blankenship, Michael Shin, Mohamed Hussein, and Erika Olimpiew for their hard work producing and reviewing the figures. Erika also carefully reviewed the manuscript and proofs, and provided many useful comments. I am also very grateful to Stephanie Hiebert for her meticulous copyediting of the manuscript. Thanks are also due to the Addison-Wesley editorial and production staff for all their efforts. I would also like to thank Bran Selic for his assistance in clarifying some of the intricate details of UML 2.0.

Last, but not least, I would like to thank my wife, Gill, for her encouragement, understanding, and support of this, my third textbook.