About the Authors

Hakan Erdogmus is a research officer with the Institute for Information Technology, National Research Council of Canada, in Ottawa. His current research focuses on software economics. He is the coauthor of several articles on the subject. He holds a Ph.D. in telecommunications from Université du Québec, Institut national de la recherche scientifique, and an M.S. in computer science from McGill University, Montreal. In 1997, Hakan was the program co-chair of CASCON, the annual conference of the IBM Center for Advanced Studies. He is the coeditor of an upcoming book entitled Advances in Software Engineering: Comprehension, Evaluation, and Evolution, reporting on the research activities of the Consortium for Software Engineering Research.

John Favaro is an independent consultant based in Pisa, Italy. He was general chair of the Sixth International Conference on Software Reuse in June 2000. He is European co-chair of the IEEE Technical Subcommittee on Reuse and is a founding member of the steering committee of the Society for the Advancement of Software Education. Recently, he has published articles on principles of strategy and valuation for IT investment, including "Value-Based Software Reuse Investment" in the special issue on reuse of Annals of Software Engineering 1998; that article became the basis for the material on options in Extreme Programming Explained. He has degrees in computer science from Berkeley and Yale.

Hakan and John cowrote the tutorial on the economics of XP given at the XP Universe 2001 workshop "XP for Capitalists," hosted by Kent Beck in Raleigh, North Carolina.