The purpose of this book is to publish the latest ideas of Herbert Simon and sympathetic economists, on the subject of bounded rationality, economics, cognitive science and related disciplines, and to reprint some of Professor Simons classic papers which have appeared in journals not widely read by economists. Not only on account of his Nobel Prize in Economics, but also because of the increasingly widespread applications of his ideas and theories, it is especially valuable to readers to have a book of this kind at the present time. Currently in this whole field, there is increasing emphasis on computer-related theory building.Herbert Simon, for the past quarter century, beginning from the time when microcomputers did not exist, has been a pioneer of this approach. The book begins with an edited transcript of a colloquium, held between Herbert Simon and a group of Italian economists in Italy in 1988. It continues with the reprinted Simon papers and papers by three scholars, Raymond Boudon, Massimo Egidi and Riccardo Viale coming from different disciplines but holding a common interest in bounded rationality and ends with a response by a sympathetic economist, Robin Marris.