The third in a series on Navy Computer Managed Instruction (CMI), this report describes how the automated scoring of teletypewriting tests affects training in a system for automated performance testing (APT) which was implemented in the teletypewriter (TTY) portion of the Radioman "A" School in San Diego. The system includes a computer-generated Error Distribution Report (EDR) which provides detailed feedback on student typing errors. The objectives of this study were to determine whether test-related activities take less time under APT than under manual testing conditions, and to determine whether training time can be reduced by different applications of EDR use. Two experiments were conducted to investigate the time required to perform test-related activities under manual scoring as compared to those performed under automated testing conditions. Results indicated that testing under the APT procedures was faster than manual testing and grading, and that a majority of students favored the CMI system in general, and the APT program in particular. Fourteen references are listed. (MER)