Teacher use of individualized instruction in physical education was measured by a Level-of-Use interview developed to describe and systematically account for the way that behaviors of individuals change as they grow in their use of an innovation. This technique was developed as a tool to help trainers identify needs of teachers involved in new programs. Use of an innovation by teachers ranges from no involvement, through orientation, mechanical use, stabilization and refinement of the innovation, to creative acceptance. Testing of individualized instruction methods before and after the inservice training period provided information on how teachers change behaviorally through gradual adoption of an innovation. (JD)