Presents conceptual framework for organization of factors (independent variables) affecting online bibliographic retrieval. Roles that variables play in research studies are described and examples considering various elements--setting, user, request, database, search system, searcher, search process, search outcome--are provided. Twenty-one…

Affirms the evidence for predictive validity of assessment centers and concludes that assessment centers can work for a variety of purposes and in numerous contexts. Raises possible explainations for the predictive validity observed in assessment centers and raises implications for practice and guidance of future research. (Author/KS)