Outcomes of a four-quarter extended school year plan implemented in a Buena Vista City, Virginia, high school in 1973 are described in this paper. (The school year was divided into three 60-day quarters; each quarter is an independent unit. The tuition-free fourth or summer quarter is voluntary.) The approval process, program objectives, structure, and financial considerations are described. The most expensive components include instructional salaries, air conditioning, and student materials. Savings are apparent when the cost of the extended school year is compared to that of a full year's instruction when a student fails and must repeat a grade. Other implementation considerations include revising the teaching calendar, student report cards and scholastic records, and curriculum. A 10-year evaluation conducted in 1987 by the school board found the following outcomes: increased facility utilization, pupil attendance, standardized achievement scores; decreased dropout rate; and positive evaluations by students and faculty. (LMI)