Discusses problems involved in testing Piaget's hypothesis of topological primacy in representational space by copying geometric figures. (Author/SS)

Formal and familiar materials were used to test Piagetian classification and formal operational abilities in two groups of educated adults: one group aged 30-38 and the other aged 57-82 years. Subjects did not show mastery of the tasks. Results suggest a new model of cognitive lifespan development. (Author/MS)

Reviews the literature pertaining to spatial perspective-taking and attempts to account for the inconsistent findings in this area of research by examining the methodological differences between studies. (Author/SS)

The existence of a time lag discovered in the cross-cultural application of Piagetian tests may result from a socio-economic bias in Piaget's theory. Abstract, formal cognition may reflect a particular social structure, embodying the principles of exchange value, reification, and alienation which govern production and exchange in the…