The author details the steps involved in the adoption of a trimester program at a Texas junior high school. The trimester schedule divides the regular school year into three equal 60 day periods. The option of a summer quarter can be added as the need arises. Under the plan, school periods are 70 minutes long in the junior high school and 80 minutes long in the high schools. Class periods are divided into smaller blocks of time to better accomodate new teaching methods within a class. The program also utilizes some team teaching, open space classrooms, and resource labs. The trimester plan enables students to concentrate on fewer courses at a given time and to have more school resources available. It also allows students who do not make adequate progress the opportunity to catch up within the school year without any loss of normal course offerings. The schedule gives teachers a longer planning period, the opportunity to teach more in their fields of interest, increased student contact, and the opportunity to work with each student in his prime learning time of day. (Author/DN)