At the University of Illinois at Urbana, a computer based curriculum called Automated Computer Science Education System (ACSES) has been developed to supplement instruction in introductory computer science courses or to assist individuals interested in acquiring a foundation in computer science through independent study. The system, which uses PLATO terminals, is presently in routine use in several courses at the University of Illinois, and it has been used at Wright Community College in Chicago. Recent changes in programing and technical innovations have increased its instructional effectiveness. The first section of this report describes the goals and design of ACSES. Later sections provide yearly reviews of progress made for the duration of a grant from the National Science Foundation. (EMH)