The paper describes the Interactive Model for Professional Action and Change for Teachers (IMPACT), a collaborative project based on a consulting teacher model which provides inservice classroom based inservice training for teachers and individualized instruction for high school students with mild handicapping conditions. The model incorporates three levels of inservice teacher training: workshops (arranged by the consulting teachers in response to the basic competency areas identified by groups of teachers); courses (offered for graduate credit by the consulting teachers in areas which include learning strategies, curriculum development, and behavior management); and consultation (provided in the form of team teaching between regular and special educators). The IMPACT program in an English department and in a math department exemplified competency training and use of the workshop for inservice training. It is concluded that the model of collaboration between regular and consulting teachers utilized five components in inservice training (theory, demonstration, practice, feedback, and coaching) and resulted in both effective staff development and actual change in the classroom. (SB)