A pretheoretical model of cognitive development is proposed which is based on the empirical establishment of Gagne's cumulative learning sequences. (Author)

Studies of the hierarchical attainment of conservation of physics concepts revealed significant differences with respect to age, sex, and grade level in a random sample of seventh and eighth grade students. Conservation of a quantity did not necessarily depend on the prior conservation of its constituent fundamental quantities. (MLH)

A study was conducted to clarify a number of issues related to Piaget's theory of invariant sequantiality in child cognitive development. Ss were 143 middle-class white children of bright, average and retarded psychometric abilities (measured by performance on the Stanford-Binet Intelligence Test). Bright and average Ss were chronologically aged…

As an example, two aspects of children's conservation are explained: decalages and the shift from perceptual to quantitative cues. This approach, relative to structuralist formulation, involves cognitive factors such as prior learning, as well as impinging social experience. It is compatible with Piaget's theory, yet simpler and more flexible. (CP)

The effects of conservation activities on children's acquisition of Piaget's conservation concepts were investigated. One hundred and twenty-eight seven-to nine-year-old children in four classrooms were given pre- and post-evaluation measures of conservation ability. The experimental group completed a set of 42 self-directed conservation…