Warren County (North Carolina) High School is in its fourth year of a plan that divides the 180-day school year into three 60-day trimesters. Each day contains four class periods, and each trimester-long course earns students one-half credit. All students and teachers are rescheduled at the beginning of each trimester. The plan's many advantages include more efficient use of time, encouragement of faculty coordination, improved scope for broadening the curriculum, decreased demands on resources, greater flexibility in scheduling and making changes, and increased time during the day for the development of effective relationships between students and teachers. Disadvantages include the breakup into two or more parts of courses traditionally seen as whole units, class periods that may be overlong for some subjects, decreases in the number of days available for development of relationships between students and teachers, difficulties in scheduling for transfer students, and the need to undertake the scheduling process three times a year rather than twice. Under the plan, students graduating have shown an increase in the number of units earned. The plan also enabled many students who failed the first trimester of a standard two-trimester course to retake the first trimester and still complete the course for full credit by the end of the year, a recovery rate impossible under semester organization. (PGD)