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The development of relevance in evaluating IR systems is described and also the important differences be tween such systems and OPACs. Characteristics of the end- users of both systems are discussed with the conclusion that end-users' motivation and behaviour are as yet not fully under stood. The implication of this is that relevance is a central feature, but only one, of an OPAC user's overall information need. <\/jats:p>","DOI":"10.1177\/016555159001600407","type":"journal-article","created":{"date-parts":[[2007,3,18]],"date-time":"2007-03-18T06:07:59Z","timestamp":1174198079000},"page":"265-271","source":"Crossref","is-referenced-by-count":5,"title":["Relevance as an aid to evaluation in OPACs"],"prefix":"10.1177","volume":"16","author":[{"given":"Ann","family":"O'Brien","sequence":"first","affiliation":[{"name":"Department of Library and Information Studies, Loughborough University of Technology, Loughorough, Leics LE 3TU, UK"}]}],"member":"179","published-online":{"date-parts":[[1990,8,1]]},"reference":[{"volume-title":"Using Online Catalogs: a Nationwide Survey","year":"1983","author":"J.R. Matthews","key":"atypb1"},{"key":"atypb2","unstructured":"S. Walker, The Okapi online catalogue research projects. In: C.R. Hildreth (Editor), The Online Catalogue. 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