The papers in this volume represent work by scholars on discourse, interaction, and communication. They report work done from widely divergent points on the theoretical spectrum of cognitive science, and from different disciplinary starting points (philosophy, logic, linguistics, artificial intelligence). Not only do these works represent the main topics and the wide range of differing positions presented at the fourth International Colloquium on Cognitive Science (ICCS-95), but despite their differences (or perhaps because of these differences) they also display many clear directions for future research in these three central areas of cognitive science.