In this study of current and potential users of teleconferencing media in post-high school settings, more than 50 teleconferencing systems in the United States and Canada were surveyed. Researchers examined instructional, administrative, student service, and interorganizational uses of teleconferencing in educational organizations ranging from university extensions and professional associations to community volunteer organizations. The report includes detailed case studies of 13 existing systems and a comparative analysis of the characteristics of 46 educational networks. Having explored future uses of these media in light of likely societal trends, the Institute's judgment is that the use of teleconferencing in postsecondary education will continue to increase, but at a rate much slower than that predicted for earlier educational technologies. The most promising possibilities are in specific areas of instruction, such as courses that meet requirements for professional recertification. The operational guidelines provided include a set of preconditions or prerequisites for implementation of a teleconferencing system to facilitate the start-up process and to identify areas where teleconferencing does not seem appropriate, as well as guidelines for effective usage once a system has been established. (Author/RAO)