The purpose of this study was to design a prototype written test of cognitive development based on the model of Piaget. Although the results were not consistent with Piaget's theory, test development was only partially successful. Specifically, validation of the scales was excellent or poor depending on the perspective. Analysis of the item…

Reexamined Piagetian stages of males (N=182) and females (N=176), ages nine to eighteen, using cluster analysis, and sought information concerning occurrence of stages and influence of different tasks and gender on cluster patterns. Findings, among others, indicate that deviation from Piagetian stages was influenced by gender and type of task.…

A Blind Learning Aptitude Test (BLAT) was developed on the basis of sense of touch rather than on conventional experience, fine sensory discrimination, or verbal competency. From a pool of about 350 items, most of them used in testing intelligence in the sighted, a pool of 94 was selected and embossed after the manner of braille. A residual pool…