Having been involved in the production of most of the databases as well as the design of the evaluation protocols, it has been my privilege to receive the benefits of the sustained contributions of many colleagues who have supported these projects with their dedicated efforts. I would like especially to thank Paul Albrecht, Jim Bailey, Ted Baker, Rich Bowser, Don Brodnick, Jerry Cox, Phil Devlin, Charlie Feldman, Scott Greenwald, Russ Hermes, David Israel, Franc Jager, Carlo Marchesi, Roger Mark, Joe Mietus, Warren Muldrow, Diane Perry, Scott Peterson, Ken Ripley, Paul Schluter, Alessandro Taddei, Roy Wallen, and Cees Zeelenberg.