School records of 643 ninth-grade students were examined. Classroom adjustment was measured by the Classroom Behavior Inventory. Results indicated that mobility was negatively related to math achievement and adjustment. Results are discussed in relation to the peer society and the use of these data for schools. (Author/RL)

Effects of multiage grouping on achievement and self-concept were explored. No significant differences were found between children in multiage and single-age classrooms on any of the achievement measures. Multiage classrooms had higher mean scores on one of the six factors of the self-concept scale, Happiness and Satisfaction. (Author/GK)