The Automated Computer Science Educational System (ACSES) has been developed at the University of Illinois for the purpose of providing improved education for the large number of students taking introductory computer science courses. The major components of this system are: a library of instructional lessons, an interactive programing system with excellent error diagnostics, an information retrieval system, an automated exam and quiz system, and several lessons which judge student programs. This report briefly describes each of these components, as well as some ideas on programing language design resulting from this experience, and presents an evaluation of the use of the system over the past three years. (Author)