"Interdisciplinarity," the integration of concepts and methods between disciplines in teaching and research, may provide an important key to the innovations required in universities to meet the intellectual and social demands of the present time. This report is based on a seminar held in September 1970 and reports the subsequent reflections of a group of distinguished authors. A careful analysis of interdisciplinarity is presented and its impact on teaching and research as adapted to changes in both knowledge and society is examined. It is concluded there is real need not so much to eliminate any of the disciplines but to teach them in the context of their dynamic relationship with other disciplines and in terms of societal problems. The report is in 3 parts. The first, "Opinions and Facts," presents information collected during an extensive survey of universities on interdisciplinary activities in teaching and research. The second part, "Technology and Concepts," considers the subject within the framework of developing scientific knowledge and the requirements of a rapidly changing industrial society. The final part, "Problems and Solutions," studies institutional structures, curricula, teaching methods and teacher training programs, all of which are issues basic to any reorganization of universities. (HS)