Preface Wilson 1975).Perhaps so.But the present approach is stra- tegic rather than genetic.It uses an evolutionary perspective because people are often in situations where effective strat- egies continue to be used and ineffective strategies are dropped.Sometimes the selection process is direct:a mem- ber of Congress who does not accomplish anything inin- teractions with colleagues will not long remain a member of Congress. It is a pleasure to acknowledge the help received at vari- ous stages of this project from Jonathan Bendor,Robert Boyd,John Brehm,John Chamberlin,Joel Cohen,Lou Erste,John Ferejohn,Patty French,Bernard Grofman, Kenji Hayao,Douglas Hofstadter,Judy Jackson,Peter Katzenstein,William Keech,Martin Kessler,James March, Donald Markham,Richard Matland,John Meyer,Robert Mnookin,Larry Mohr,Lincoln Moses,Myra Oltsik,John Padgett,Jeff Pynnonen,Penelope Romlein,Amy Sal- dinger,Reinhart Selten,John David Sinclair,John T. Scholz,Serge Taylor,Robert Trivers,David Sloan Wilson, and especially Michael Cohen.I would also like to thank all the people whose entries made the tournaments possi- ble.Their names are given in appendix A. With gratitude I acknowledge the institutions that made this work possible:the Institute of Public Policy Studies of The University of Michigan,the Center for Advanced Study in the Behavioral Sciences,and the National Science Foundation under Grant SES-8023556. XPreface Wilson 1975). Perhaps so. But the present approach is stra￾tegic rather than genetic. It uses an evolutionary perspective because people are often in situations where effective strat￾egies continue to be used and ineffective strategies are dropped. Sometimes the selection process is direct: a mem￾ber of Congress who does not accomplish anything in in￾teractions with colleagues will not long remain a member of Congress. It is a pleasure to acknowledge the help received at vari￾ous stages of this project from Jonathan Bendor, Robert Boyd, John Brehm, John Chamberlin, Joel Cohen, Lou Erste, John Ferejohn, Patty French, Bernard Grofman, Kenji Hayao, Douglas Hofstadter, Judy Jackson, Peter Katzenstein, William Keech, Martin Kessler, James March, Donald Markham, Richard Matland, John Meyer, Robert Mnookin, Larry Mohr, Lincoln Moses, Myra Oltsik, John Padgett, Jeff Pynnonen, Penelope Romlein, Amy Sal￾dinger, Reinhart Selten, John David Sinclair, John T. Scholz, Serge Taylor, Robert Trivers, David Sloan Wilson, and especially Michael Cohen. I would also like to thank all the people whose entries made the tournaments possi￾ble. Their names are given in appendix A. With gratitude I acknowledge the institutions that made this work possible: the Institute of Public Policy Studies of The University of Michigan, the Center for Advanced Study in the Behavioral Sciences, and the National Science Foundation under Grant SES-8023556. x