This report describes a practicum project that was intended to develop, implement, and supervise a building teacher aide training program and to determine its impact on the performance of forty building teacher aides in the Dallas Independent School District. The design of the training program was to improve the performance of teacher aides in management services, multimedia services, clerical services, library activities, classroom procedures, office routines, and communication with students, while also improving teacher/aide relationships and giving aides a better understanding of their roles and responsibilities. Pretests and posttests administered to teacher aides in seven experimental and seven control schools showed that aides who participated in the training program showed significant improvement in all areas compared with the control groups. Detailed test results are presented, and copies of the tests and of the ten behavior checklists completed periodically by principals of the experimental schools are also included. (Author/JG)