This collection of over 40 milestone contributions presents the latest state-of-theart research emerging from one of the worlds foremost centers for Artificial Intelligence. Thetopics range from immediately applicable, demonstrated advances to theoretical proposals. Theyinclude robotics, vision, natural language, learning and commonsense problem solving, model-basedreasoning systems, engineering problem solving, programmer's apprentice, mixed symbolic andnumerical computation, ultraconcurrent systems, and basic theory. Each new area is introduced andlinked together with an overview by Patrick WinstonThe contributors are: Harold Abelson, Gul Agha,Chae H. An, Christopher G. Atkeson, David J. Bennett, Robert C. Berwick, David Brock, Rodney A.Brooks, William J. Dally, Randall Davis, Bonnie J. Dorr, Brian Eberman, Michael Eisenberg, SandiwayFong, W. Eric L. Grimson, Matthew Halfont, Walter C. Hamscher, Carl Hewitt, Jessica Hodgins, John M.Hollerbach, Berthold K. P. Horn, Joseph L. Jones, Boris Katz, Jacob Katzenelson, Christof Koch,Tomas Lozano-Pérez, Michael Levin, Matthew T. Mason, Emmanuel Mazer, David A. McAllester, MarvinMinsky, Patrick A. O'Donnell, Tomaso Poggio, Marc H. Raibert, Sajit Rao, David J. Reinkensmeyer,Charles Rich, Elisha Sacks, Kenneth Salisbury, Warren P. Seering, Neil C. Singer, Gerald J. Sussman,Russell H. Taylor, Vincent Torre, William Townsend, Shimon Ullman, Karl T. Ulrich, Richard C.Waters, E. J. Weldon Jr., Brian Williams, Linda Wills, Patrick H. Winston, Jack Wisdom, and KennethYip.Patrick H. Winston is Professor of Electrical Engineering and Computer Science and Director ofthe Artificial Intelligence Laboratory at MIT. Sarah A. Shellars is an editorial assistant at theArtificial Intelligence Laboratory. Artificial Intelligence at MIT is included in the ArtificialIntelligence Series, edited by Michael Brady, Daniel Bobrow, and Randall Davis.