During the 1992-93 school year, the leadership of Benjamin Russell High School, located in Alexander City, Alabama, decided to experiment with blocked class periods. Under this option, sometimes referred to as the Copernican System, subjects are taught in double periods rather than in the conventional 50-minute periods normally used in most schools. One fewer subject is taught during any one semester. Four classes of ninth graders were chosen for the blocked treatments--one for each subject area--mathematics, science, English, and Alabama history/world geography. Data analysis included a review of students' grades. In three of the four academic areas, the performances of block students did not appear to differ significantly from those of regular-section students when preexisting student differences were controlled. Teachers initially had difficulties in planning and for students there was also an adjustment period. By the second semester, however, students expressed more positive attitudes toward the block schedule. Teachers were committed to try the block sections without having clarification on how the alternative time schedule could best be utilized. It is recommended that schools use a wider range of tools to measure student achievement. Five tables, two figures, and a master schedule are included. Contains two references. (LMI)