A test scoring system was developed, composed of an optical mark sense card reader (Chatsworth Data Corporation) interfaced with a microcomputer (TRS-80 Model I) that provided the opportunity to do extensive diagnostic and course material testing with item analysis. This system reduced the amount of time required to determine the suitability of test items and identify difficult topics for students of varied abilities. The system was a less expensive alternative to purchasing a test scoring machine, which was incapable of providing extensive item analysis. The system hardware, software, and answer card design are described in detail. Many versions of the test scoring and item analysis (TSIA) program, written in BASIC, are currently in use. The author describes his operating experience with the system over a 9-month period. (DWH)