Abstract : The ARI Fort Knox Field Unit has been involved for approximately 10 years in the development of innovative approaches to training for the Armor community and for the Army as a whole. this effort has recently been given special emphasis through the formation of the Training Technology Field Activity (TTFA), a partnership among ARI, the Training and Doctrine Command, and the U.S. Army Armor Center. The purpose of the TTFA is to increase the effectiveness and efficiency of training through the application of appropriate new technologies. This report focuses on the development of computer-assisted instructions (CAI) for training tank commanders to man the new M1 Abrams Tank. Mid-grade noncommissioned officers selected for this course take a diagnostic test before training to determine if they are proficient on course prerequisites. Soldiers failing one or more prerequisite tasks are charged to become proficient, on their own time, early in the course. In an effort to make both testing and remediation more efficient and effective, a CAI program that presents remedial instruction automatically was developed. This frees scarce instructor resources for concentration on new learning. This report describes the analysis and design of a CAI-based diagnostic testing and remedial training program.