Describes the research objectives, rationale, methodology, and findings of a model program developed at the Northwestern University Library, which examined whether online catalogs require instruction and, if so, how that instruction would be best delivered. (CLB)

Reports the rationale, design, implementation, and results of an examination of the impact of online subject catalogs on users by comparing their behaviors before and after catalog installation. Evaluation criteria included volume of use, types of searches, use of other catalogs, search time, user satisfaction, and need for assistance. (CLB)