Part One, Automatic Content Analysis contains: "Content Analysis in Information Retrieval;""The 'Generality' Effect and the Retrieval Evaluation for Large Collections;""Automatic Indexing Using Bibliographic Citations" and "Automatic Resolution of Ambiguities from Natural Language Text." Part Two, Automatic Dictionary Construction, includes: "The Effect of Common Words and Synonyms on Retrieval Performance;""Negative Dictionaries" and "Experiments in Automatic Thesaurus Construction for Information Retrieval." Part Three, user feedback procedures, includes: "Variations on the Query Splitting Technique with Relevance Feedback;""Effectiveness of Feedback Strategies on Collections of Differing Generality;""Selective Negative Feedback Methods" and "The Use of Past Relevance Decisions in Relevance Feedback." Part Four, clustering methods, includes: "A Controlled Single Pass Classification Algorithm with Application to Multilevel Clustering" and "A Systematic Study of Query-Clustering Techniques: A Progress Report." Part Five, on-line retrieval system design, contains: "A Prototype On-Line Document Retrieval System" and "Template Analysis in a Conversational System." (Author:NH)