This study compares the scholastic achievement of 2,811 students enrolled in Fairfax County, Virginia, Public Schools for the 1983-1984 school year. Scholastic achievement of an experimental group of 1,068 students enrolled in combination or split/grade classes is compared with a control group of 1,743 students enrolled in regular graded classes. Five research questions were developed, three of which related directly to grade level student scholastic achievement by comparing test results for combination and regular grade classes, and two which attempted to identify any significance resulting from differences used by principals to select teachers and students for placement in combination classes.