The aim of Spatial and Temporal Reasoning is to give a picture of current research in this area focusing on both representational and computational issues. The picture emphasizes some major lines of develpment in this multifaceted, constantly growing area. The material in the book also shows some common ground and a novel combination of spatial and temporal aspects of qualitative reasoning Part I presents the overall scene. The chapter by Laure Vieu is on the state of the art in spatial representation and reasoning, and the one by Alfonso Gerevini gives a similar survey on research in temporal reasoning. In Part II, Roberto Casati and Achille Varzi examine the ontological status of spatial entities; Anthony Cohn, Brandon Bennett, John Gooday and Nicholas Gotts present a detailed theory of reasoning with qualitative relations about regions; and Annette Herskovits focuses on the linguistic expression of spatial relations. In Part III, James Allen and George Ferguson describe an interval temporal logic for there presentation of actions ad events; and Drew McDermott presents an efficient way of predicting the oucome of plan execution. In Part IV, Antony Galton's chapter stands clearly between the two areas of space and time and outlines the main coordinates of an integrated approach.