Inspection of findings from Denney and Ziobrowski (1972), in light of problems of analysis and method, seriously questioned the validity of their reported crossover interaction of clustering criteria with age. In addition, a replication of their experiment, correcting for methodological problems, revealed no interaction of clustering criteria with…

Study 1 asked second through sixth graders, who could answer inclusion questions, to answer such questions without empirical information about relative quantity and to predict whether subordinate classes could be made larger than their superordinate classes. In study 2, children's performance in two part-whole domains, classes and collections, was…

This study was designed to contrast children's recall clustering before and after they acquired stable input organizations. A sample of 120 subjects (24 from preschool grades, 1, 4, 7, and college) performed two successively presented, procedurally identical, series of recall-sort-recall tasks. (Author/JMB)