The papers in this collection of 71 individual papers and 3 symposiums represent some of the most current thinking in educational communications and technology. For the first time, a selected number of development papers sponsored by the Division for Instructional Development are included. Topics discussed include the effects of various conditions on the learner and learning, including aptitude treatment interactions; learning strategies; teacher planning; instructional design and development; teaching strategies; the teacher's role; teacher education; research methodology; networking; computer-assisted instruction; hypermedia; distance education; teleconferencing; interactive video; computer simulations; and the instructional environment. The three symposiums focused on ethics, social considerations in educational computing, and the significance of the Channel One experiment. While research reports predominate, some reviews of the literature and opinion papers are included. This volume also includes a list of Research and Theory Division officers; a list of the reviewers of the papers for the conference; a list of proceedings from the year 1979 together with their ERIC document numbers; a description of the Association for Educational Communications and Technology (AECT) and a membership enrollment form; a table of contents; and author and descriptor indexes. (BBM)