College students, ranked as high, medium, or low ability, were assigned to homogeneous or mixed-ability groups of two through five members for a test. Performance proved proportional to the number of high ability group members. The underlying group process was inferred through social decision scheme analysis. (Author/SJL)

With new knowledge and tools at their disposal, educators at all levels are exploring alternatives to ability grouping in order to improve schooling for all students. Bringing about positive results requires the development and utilization of knowledge about how ability grouping affects schools, exploration of beliefs that support grouping, and…