The characteristics of individualized services offered by the Northwest Staff Development Center in Livonia (Michigan) to teachers in seven school districts were studied and a user profile was sought as a measure of program effectiveness. Services were requested directly by individual teachers and administrators to meet specific needs. Requests for services by 277 practitioners and the results of interviews with 51 users conducted by volunteer teachers were analyzed. The inquiry established: (1) characteristics of an individualized delivery system; (2) the difference between individualized service and other teacher center delivery systems; (3) the relationship between the type of service request and selected user characteristics; (4) the differences between teachers who made frequent requests and those who made few requests; (5) the networking effect among teachers who used individualized services; (6) the role of the school principal in the process; and (7) the impact of the services on educators' job-related behaviors and their perception of student achievement. The typical frequent user was an experienced female elementary school teacher who found the experience rewarding both personally and professionally and who saw improvement in student performance as the result of her request. Appended are a description of the center activities, copies of individualized service request forms, an interview form, and responses to the research questionnaire. (Authors/JD)