An evaluation was made of the biomedical Computer Assisted Instruction (CAI) Network Experiment, established by the National Library of Medicine in 1973 to test the feasibility of sharing CAI learning materials through a national computer network. The evaluation was designed to assist decision makers in planning a future mechanism for distributing biomedical CAI. The study focused on the institutions (95 as of October 1974) and people who use the network and the contractors who supplied the CAI library. Data sources included case studies, user reports, and interviews with hospital and medical school administrators, faculty, librarians, computer laboratory staff, and students. Network usage by program type, by user institution, and by class of user were analyzed. Also analyzed were the impact of the network on curricula, faculty, students, libraries, and media centers as well as the cost/benefits. The report includes a roster of the participants in the network experiment. (Author/EMH)