Preschool and kindergarten nonconservers (N=114) were examined for their use of dimensions relevant to quantity in two conservation-of-substance tasks. The results were interpreted as being counter to Piaget's 4-step equilibration model of the development of compensation and conservation. (ST)

This study compared the use of discrete and relational aspects of visual configurations in making similarity judgments. Subjects were 3-, 4-, 5-, and 8-year-old children and adults. (BD)

This study investigates the developmental changes that occur in the attending behavior of children engaged in a relatively simple classification task, and attempts to reaffirm the existence of developmental changes in stimulus preferences and in the ability to employ double classification systems. Subjects were 24 preschool and 24 first grade…

The influence of the ability to conserve length in the development of a size concept was investigated in males and females aged 4 years through 9 years. (GO)