Levels of Use (LOU) interviews can be used for formative evaluation purposes in an intermediate education agency. Programs and services for training teachers provided to districts are evaluated. LOU interviews give program staff unique information for improving programs. Program improvement is aided by LOU interviews because information is provided that program staff cannot obtain on their own. The information corroborates whether programs are proceeding according to plan. Evaluation and program staffs develop a stronger working relationship and both gain an understanding of the program. Well defined relevant criteria is the goal of the process. Survey instruments do not reveal the same kind of information. The interview technique allows communication and effectively identifies how teachers are using the innovation. A wealth of formative evaluation information is provided by the interviews in the areas of student characteristics, materials, objectives, testing, and classroom management. The information proved useful in identifying areas of need and allowed project staff to make decisions for program improvement. It is especially valuable in its application to the purposes of formative evaluation by practitioners responsible for effective change in schools. The major limitation cited was the cost to execute valid evaluation. (DWH)