Writers discuss the extraordinary growth of the computer in its first twenty years and its use in fields as diverse as medicine and economics, management and physics. Employed in areas once thought to be exclusively the province of the human mind, the computer rendered profound changes in the traditional ways and means of decision making. Contributors include C.P. Snow, Walter A. Rosenblith, Norbert Wiener, Vannevar Bush, Herbert A. Simon, Howard W. Johnson, Marvin L. Minsky, Peter Elias, J. C. R. Licklider, Elting E. Morison, Philip M. Morse, Jay W. Forrester, Grace M. Hopper, Alan J. Perlis, John R. Pierce, Robert C. Sprague, Claude E. Shannon, Charles C. Holt, John G. Kemeny, Donald J. Marquis, Gene M. Amdahl, Sidney S. Alexander, Robert M. Fano, and others.