In this volume, experienced distance educators provide insights into new trends in computer-based teaching and learning in postsecondary education. The book is divided into four parts: (1) Issues and Trends; (2) Instructional Design Principles for Distance Learning; (3) Alternative Delivery Systems for Distance Learning; and (4) Administrative Issues for the Distance Instructor. The following papers are presented: "Issues and Trends To Take Us into the Twenty-First Century" (George P. Connick); "Competence in Teaching at a Distance" (Thomas E. Cyrs); "Interactivity: From Agents to Outcomes" (Ellen D. Wagner); "Visual Thinking: Let Them See What You Are Saying" (Thomas E. Cyrs); "Student-Centered Instruction for the Design of Telecourses" (M. Winston Egan, Gordon S. Gibb);"Learner Development: Beyond the Technology" (Darcy Walsh Hardy, Mary H. Boaz); "Teaching by Television" (Virginia A. Ostendorf); "Teaching by Telephone" (Christine H. Olgren); "The Internet: A Learning Environment" (Rory McGreal); "Networked Learning Environments" (Alan G. Chute, Pamela K. Sayers, Richard P. Gardner); "Evaluating Teaching and Learning at a Distance" (Michael R. Simonson); "Copyright: Opportunities and Restrictions for the Teleinstructor" (Janis H. Bruwelheide); "Distance Learning and the Digital Library: Transforming the Library into an Information Center" (Roberta L. Derlin, Edward Erazo); and "Managing Information Resources and Services in a Distance Environment" (Robert S. Tolsma). (AEF)