Knowledge-based systems have been successfully developed in practice for a number of years. However, they are often "only" stand-alone systems: integrating them into existing information environments, eg making available real production data to an expert system, often either fails or is only solved in a dissatisfying way. Possible reasons for this might be on one hand the lack of know-how about the different features of various experimental AI techniques, and on the other the lack of more classical information and database system technology. The special interest groups "Knowledge Representation" and "Methods for the Development of Information Systems and their Application" of the German Informatics Society (GI) organized a joint workshop in Ulm in March 1990 to discuss the integration of Artificial Intelligence and database technology. This volume contains the proceedings of the workshop. This book of proceedings on computer science, AI, information systems, knowledge-based management systems, software engineering, CAD and office systems is intended for researchers, practitioners, graduate students.