The hierarchical structure of the formal operational period of Piaget's theory of cognitive development was explored through the application of ordering theoretical methods to a set of data that systematically utilized the various formal operational schemes. Results suggested a common structure underlying task performance. (Author/BH)

The Hiskey-Nebraska Test of Learning Ability was administered to 550 deaf children and 614 hearing children. Three of the eight subtests showed different factor patterns when the results for the two groups were factor analyzed, suggesting that sensory deprivation alters the equilibrium and integration of perceputal and conceptual abilities.…

Mixed Rasch models add latent classes to conventional Rasch models, assuming that the Rasch model applies within each class and that relative difficulties of items are different in two or more latent classes. This article considers a family of stochastically ordered mixed Rasch models, with ordinal latent classes characterized by increasing total…

Adapting curricula to the cognitive developmental level of students has been hindered by the difficulty of assessing those levels in students. The reliability and validity of a paper-and-pencil Piagetian assessment are discussed. (Author/ JKS)