This report describes results of the first year of a three-year program to develop and evaluate a new Adaptive Computerized Training System (ACTS) for electronics maintenance training. (ACTS incorporates an adaptive computer program that learns the student's diagnostic and decision value structure, compares it to that of an expert, and adapts the instructional sequence so as to eliminate discrepancies.) Chapter 1 overviews first-year objectives and accomplishments. Chapter 2 describes this interactive system and the four functional units of training that it models and simulates: the task being trained and student, instructor, and instructional logic. Other topics include the hardware configuration, the instructional approach, and the software. Chapter 3 focuses on the pilot study to yield data on the subjects and training potential of ACTS and to test ACTS so that modifications could be made for the full-scale study in year 2. Appendixes, amounting to approximately one-half of the report, include a student handout with an introduction to the task and to concepts relevant to power supplies in general and to the 1P-28 in particular and with a troubleshooting guide and sample instructional sequences for a preliminary lecture and a troubleshooting lecture and presentation. (YLB)