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)

The effects of modeling and corrective feedback on conceptual rule acquisition and retention were studied with a total of 48 3- and 4-year-old children. Equal numbers of children from each age group were randomly assigned to one of four training groups: modeling, corrective feedback, modeling and corrective feedback, and a no modeling/no…

Discusses students' formation of concepts about energy, classifying responses as living/nonliving, human (vitalism or activity), and nonhuman (supply or demand). Observations were based on class discussions and free writing, followed by questioning to check on stability of concepts. Also collected and reported are student responses (examples of…