CONTENTS--(1) AN ASSOCIATIVITY TECHNIQUE FOR AUTOMATICALLY OPTIMIZING RETRIEVAL RESULTS BY RONALD R. ANDERSON. AN ASSOCIATIVE TECHNIQUE BY WHICH IT IS POSSIBLE TO AUTOMATICALLY EXPAND AND NARROW THE NUMBER OF DOCUMENTS RETRIEVED AND TO RETRIEVE DOCUMENTS RELATED TO A REQUEST EVEN THOUGH THEY MAY NOT BE INDEXED BY THE EXACT TERMS OF THE REQUEST IS EXPLAINED. (2) A SYNTACTICALLY ORIENTED NATURAL LANGUAGE DOCUMENT RETRIEVAL SYSTEM WITH A BROWSABILITY FEATURE BY ANDREW J. KASARDA. A TEXT PROCESSING SCHEME IS DEFINED FOR SYNTACTIC AND SEMATIC REDUCTION OF FULL TEXT, AND A RETRIEVAL MODEL WHICH PROVIDES FOR THE USE OF NATURAL LANGUAGE COMMUNICATION FOR THE INQUIRER AND A BROWSABILITY CAPABILITY IS DESCRIBED. (3) PHRASE INDEXING BY DAVID M. REED. A MANUAL INDEXING SYSTEM USING PHRASES IS DEVELOPED AND EVALUATED, AND RETRIEVAL OPERATIONS FOR MANUALLY AND AUTOMATICALLY PHRASED INDEXED SYSTEMS ARE DISCUSSED. THIS DOCUMENT IS AVAILABLE AS AD-653-280 FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VIRGINIA 22151, $3.00 FOR HARD COPY, $0.65 FOR MICROFICHE, 28 PAGES. (CM)