A developmental project was designed to improve the course of study for Reading Specialist Credential candidates at California Polytechnic State University in San Luis Obispo (Cal Poly). The project is an example of action research that systematically developed an inservice presentation for improvement of classroom instruction in language arts. Reading Specialist candidates reviewed the literature, developed evaluation criteria, designed an inservice outline, and implemented the program in a variety of school settings. The Reading Coordination of the University Center for Teacher Education at Cal Poly validated the development process and the inservice by including both in the course of study for "Education 531: Supervision of Reading." The results of the project showed that the systematic development of an inservice on instructional grouping for an integrated language arts program did improve the training course of study for reading specialist candidates at Cal Poly. Recommendations include the implementation of the development process and inservice outline in the "Reading Specialist Course of Study" at Cal Poly. (Contains 12 references. Appendixes present an evaluation form, a grouping inservice outline, and a grouping inservice evaluation form.) (Author/RS)