This report describes the beginning, development, and implementation of Atlanta's four-quarter school year program. Under the plan, students attend any three of the four quarters offered each year, or they may enroll in all four quarters to take remedial or enrichment courses or to graduate early. The report indicates that during the first summer quarter of operation, approximately 39 percent of Atlanta's high school students enrolled in one or more courses. Main sections provide background information on (1) Atlanta and the needs of Atlanta students, (2) educational planning in Atlanta, (3) the development of the quarter plan and the process of informing the community, and (4) implementation of the plan. One section offers answers to frequently asked questions about the plan. Nine appendixes comprise guides for two courses, one in mathematics and the other in English; flow charts for science and mathematics; procedures for revising course offerings; a complete list of English courses; a conversion table for changing Carnegie units into quarter hours; requirements for high school graduation; the calendar for school years 1968-69 and 1969-70; courses offered in two different high schools; and some special learning opportunities available under the quarter plan. (Author/DN)