A 3-year program was implemented in eight middle schools in the Charleston County School District (South Carolina) in fall 1986 to cope with high rates of student misconduct. The program sought to improve the clarity of school rules and the consistency of rule enforcement, classroom organization and management, frequency of communication to the home regarding student behavior, and reinforcement for appropriate behavior. The use of school improvement teams and feedback to foster program implementation is described along with numerous measures used to assess program implementation. Program results indicate that the strength and fidelity of implementation varied considerably from school to school and were tied to the level of administrator support for the program. Student conduct improved significantly in schools where the program was implemented well. Speculations about effective discipline programs conclude the document. Appended are 10 tables and 1 figure. (39 references) (CLA)