The Study of User Behavior on Information Retrieval System s Christine L . Borgman Graduate School of Library and Information Scienc e University of California, Los Angele s Introductio n Information retrieval systems exist in many forms and in many contexts . They reside on computers ranging in size from micros to mainframes, support from one to severa l hundred databases, which in turn range in size from a few hundred to a few millio n records, and the number of searchers varies from one to hundreds of thousands . It is difficult, if not impossible, to address the user behavior issues that all ' these systems have in common . While we know of the existence of a multitude of systems , only a relatively small number have been studied from a user behavior perspective . We will limit our discussion to these systems, and speculate briefly on factors tha t might be in common with other types of retrieval systems . The most widely studied retrieval systems, from a user behavior perspective, fall int o two classes : commercially or government supported bibliographic retrieval system s (e .g., Dialog, BRS, Orbit, MEDLINE) and online catalogs
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