This report familiarizes educators with the general nature of various electronic teaching systems. The material is organized into major chapters on audio equipment, visual display equipment, television teaching systems, computer assisted instruction, and student response systems. Other chapters describe several systems and approximate equipment costs, and illustrate a typical physical layout and basic components of the system discussed. Appendixes contain a glossary of the most commonly used technical terms dealing with electronic teaching aids, the names and addresses of major manufacturers of electronic teaching equipment, a bibliography of suggested readings, basic information data sheets, and a list of other EFL publications. (Data sheets pp. 125-161 may reproduce poorly because of marginal legibility.) (MLF)