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This revised, updated and expanded text, the second edition of "New Horizons in Information Retrieval", provides an introduction to the principal generic approaches to information retrieval research with their associated concepts, models and systems. Examining major themes which have preoccupied researches, the emphasis is on research carried out in relation to textual and documentary retrieval systems. New chapters include hypertext and information retrieval, and an analysis of the debate between cognitive and traditional researchers.