Investigated developmental trends in organization and free recall as they interact with spatial representation and blocking. Subjects were 695 children in grades 4, 6 and 8. Task factors appeared to interact with developmental trends in both organization and free recall. (GO)

Investigated the development and fragmentation of categories over chronological and mental age without the requisite of free recall. Kindergarten, fourth grade, ninth grade and retarded students labeled and categorized chromatic slides of picturable objects. (GO)

Research on 128 children is presented as evidence of the superiority of a new clustering measure (X) over a more traditional "chance clustering" measure (sigma) as a means of organizing material to be learned to facilitate recall. X is shown to meet three criteria for a measure of a developmental process: X is more highly correlated with recall…