Individual Piagetian Epistemological Development of Children from Ages 6 to 11

This long-term study of children from ages 6 to 11 was undertaken to support the patterns of cognitive development inferred from Piaget's work and its short-term statistical replications. Several Piagetian tasks were used individually with 48 first graders, some of the same and new tasks with 43 of the same children as third graders, and two new tasks with 38 of the same children as fifth graders. Pearson product-moment coefficients indicated that uses of the clinical tasks in the study agreed significantly with those in the literature. In 33 individual line graphs, the average age (as indicated in the literature) for the most difficult task performed by a child at each level was compared with the actual age for the child's performance. Although individual aberrations in rates and patterns of cognitive development were observed, the graphic data supported the main hypothesis of the study.