Intended to identify and encourage research, development, and applications of information retrieval, the principal objective of this conference was to provide an international forum to promote an understanding of current research and to stimulate the exchange of ideas and experiences in information retrieval systems. Introductory material for these proceedings include listings of the conference chairpersons, officers, committee members, and sponsors. The full text is then provided for two keynote speeches: "Recent Trends in Information Retrieval" (G. Salton) and "Using Structural Representation of Anomalous States of Knowledge for Choosing Document Retrieval Strategies" (N. J. Belkin and B. H. Kwasnik). The remaining 33 papers in this collection, which are also given in full text, are organized by the conference sessions at which they were presented: (1) Office Systems; (2) User Interfaces; (3) Storage Structures; (4) Linguistic Retrieval; (5) Information Retrieval Systems; (6) Clustering; (7) Retrieval Strategies; (8) Knowledge-Based Information Retrieval; (9) Learning Systems; and (10) Probabilistic Retrieval. An index is provided of the presenters, who came from Canada, Denmark, Finland, France, Ireland, Israel, Italy, Switzerland, the United Kingdom, the United States, and West Germany. (KM)