Information Retrieval Systems: Characteristics, Testing, and EvaluationThe functions of information retrieval systems; The matching subsystem; The application of computers to information retrieval: off-line batch processing systems; On-line information retrieval; The growth of machine-readable data bases; Microforms and microform retrieval systems; Information centers and information services; Criteria by which information services may be evaluated; Evaluating the effectiveness of information services; Latent needs and expressed needs; Selecting a data base and searching; Vocabulary control; The indexing subsystem; Improving the performance of an information service on the basis of evaluation results; The evaluation of machine-readable data bases and information services derived from them; Cost-effectiveness and cost-benefitevaluation; Evaluation of a national information system; Pertinence and relevance; A brief history of evaluation; Natural language in infomration retrieval; Automatic systems; The role of informal communication; Users and user needs; The design of infomration services; The future: paperless information systems. |
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able abstracts achieved actual agricultural AGRIS analysis applied approach assigned average benefits BIBLIOGRAPHY Chapter citations collection communication complete conducted considerations considered controlled cost data base decisions demands developed discussed documents effectiveness evaluation example exhaustivity exist expressed fact factors failures field Figure files identify important improve increased index language indexing indicate individual influence information center information need information retrieval information services input interest involved journals judges language least less literature major match matter measure occur on-line operation organization output particular performance possible precision present printed problems procedures publication published ratio recall recognize record reduce referred relationship relevant represent request requirements response retrieval system search strategy searcher selection situation sources specific statement tion United various vocabulary