Third in a series on teaching methods in higher education, this updated volume reviews and evaluates research on audiovisual aids and related instructional hardware. While the emphasis is on the effectiveness of technical aids in higher education as instructional tools, some information on technical and administrative problems is also provided. Concern is primarily with British research connected with higher education, with some reference to American and other European findings and to relevant research at other levels of British education and adult life. Specific sections examine the research evidence and then summarize findings on still pictures; moving pictures (films and television); recorded sound; programmed learning and teaching machines; mixed systems and other developments (tapes and slides, multimedia systems, and the feedback classroom, which expands the programmed learning techniques to cover the operation of a whole class); and computers. A summary discussion and conclusions, and a 22-page reference list are included. (LMM)