The University of Delaware's work with computer-based instruction since 1974 is summarized with attention to the history and development of the Office of Computer-Based Instruction, university applications, outside user applications, and research and evaluation. PLATO was the system that met the university's criteria, which included support for instructional strategies such as gaming, simulation, testing, drill-and-practice, and self-paced programmed instruction; a library of computer-based learning materials; a programming language that was easy to use; a student record-keeping capability to support educational research; computer graphics; and an overall system reliability. Information is provided on credit and noncredit courses using computer-based instruction during 1984-85. Activities of the 38 departments and projects using PLATO are summarized, and sample lessons are provided. Outside user applications are also described, including pre-college demonstrations, programming courses, and courseware development. Materials include a model for project evaluation, a student evaluation form for PLATO, abstracts of computer-based education developments, and a catalog of PLATO and microcomputer programs under development. (DJR)