The work described in this book was first presented at the Second Workshop on Genetic Programming, Theory and Practice, organized by the Center for the
Study of Complex Systems at the University of Michigan, Ann Arbor, 13-15
May 2004. The goal of this workshop series is to promote the exchange of
research results and ideas between those who focus on Genetic Programming
(GP) theory and those who focus on the application of GP to various real-
world problems. In order to facilitate these interactions, the number of talks
and participants was small and the time for discussion was large. Further,
participants were asked to review each other's chapters before the workshop.
Those reviewer comments, as well as discussion at the workshop, are reflected in
the chapters presented in this book. Additional information about the workshop,
addendums to chapters, and a site for continuing discussions by participants and
by others can be found at http://cscs.umich.edu:8000/GPTP-2004/.