The Oak Park Plan, implemented in the Oak Park (Illinois) School District, was a 2-year (1983-85) project designed to correct four perceived problems: (1) low achievement levels in math for 40 percent of the students; (2) ineffective remedial instruction; (3) declining enrollment requiring an adjustment in personnel resources and service levels; and (4) a changing population requiring an adjustment in expectations and instructional methods. The Fourth "R" (Rescheduling) program restructured the use of existing personnel to reduce class size. The focus of remediation was altered to focus on continuous progress based on appropriate knowledge levels, pace of instruction, and enhanced expectations. The classroom teacher was reinstated as the person responsible for core academic instruction; pullouts and other interferences to core instructional time were eliminated. The changes were all made at no cost or minimal cost, and two independent researchers verified the effectiveness of the plan. Ongoing opportunities for staff development and the efforts of the principals and directors of instruction to improve teacher effectiveness are important for continued success of the Oak Park Plan. Fifteen references are attached. (GJ)