The computer program described is written in BASIC and, although it was developed for use at Slippery Rock State College, it could be adapted easily for other libraries using Library of Congress classification and cataloging rules. The program uses simple sequences of instructions and explanations followed by questions. Branching is employed to advance students who answer correctly to the next unit of instruction, or to send those who respond incorrectly to remedial questions. While remedial instruction has to be kept at a minimum because of the memory limitations imposed by the college's IBM 370-135 computing system, a special feature does allow students to repeat missed material. Software limitations also prevented automatic graphic presentation of instructional materials, and a manual was developed to accompany the program. Despite its limitations, the program has been highly rated by librarians, library science majors, and undergraduate students at the college and from other institutions. The basic units include a general introduction, drawer arrangement, guide cards, types of catalog cards, catalog card format, information found on a catalog card, filing rules, and subject headings. Sample pages from the program guide, the evaluation questionnaire, and an analysis of evaluation data are attached. (BBM)