One hundred sixty sibling pairs from two child families were sampled for sibling interaction behaviors as they relate to measures of categorization style. The study provides additional evidence of the importance of a child's siblings to his cognitive development. (Editor/RK)

Examines modification of mother-child instruction as a function of age of learner in middle childhood (six versus eight years). Instruction and learning were compared on two tasks designed to simulate school and home activities. Results show more intense instruction of all kinds for the younger children in the school task. (RH)