This research study addressed four issues relating to subject searching in online catalogs: faculty and student use of subject searching in library catalogs; users' knowledge of and use of the Library of Congress Subject Headings List (LCSH) in a controlled subject heading search; strategies for teaching effective subject searching; and users' preferences for improvements to achieve more effective subject searching. The researchers surveyed student and faculty subject searching patterns in card and online catalogs in a university setting; analyzed requirements for improving subject access in library catalogs; and designed, implemented, and measured the effectiveness of two models (slide-tape and library research workbook) for instruction in principles of subject searching and the use of LCSH. The report includes a discussion of the research methodology (including objectives, populations, and samples for the study; data collection; questionnaires for both the student and faculty populations; pre- and posttests and slide-tape evaluations for the student population; and development of research instruments); reports of the findings for both the student and faculty surveys; and a summary and conclusions. Appendices include the questionnaires and overall results, questionnaire cross-tabulations (including selected tables), and copies of the pretest, posttest, and slide-tape evaluation form. (THC)