Results of the experience gained in designing and using an autonomous computer-assisted testing system are reported, including conclusions based on more than two years testing with typical classes. In this system, definitely expandable auxiliary storage for testing items and programs or scores is provided. Cathode ray tube display of questions and reinforcement, and real-time checking of answers is followed by recording partial scores and updating the number of trials by each student on each exam. The system provides a self-contained, portable, and economical facility well suited to variable-paced, proficiency-based courses of study. (Author/VT)