First published in 1984. The editors of this volume are three psychologists whose work has brought them into frequent contact with other disciplines within cognitive science, particularly linguistics and artificial intelligence. Cognitive science is based on the belief that crossing the boundaries of the traditional disciplines is not merely possible, but indeed essential in the study of cognition. The purpose of this volume is to facilitate this interaction among the disciplines that constitute cognitive science, and trying to do this not by an abstract discussion of methodological issues, but by concrete example.