Pascual-Leone's neo-Piagetian theory of development is used to predict the pre- and postinstruction distributions of scores on a subject-controlled digit placement task as a function of three parameters dealing with mental strategy and capacity. (Author/ED)

Investigated the age at which children first acquire understanding of others' feelings and of ways in which they can affect others' feelings. Also considered the relation of children's development in this domain to their understanding of the nonsocial world. Findings indicated that it was possible to predict the age at which children would pass…

This paper presents a study using a neo-Piagetian theory to analyze the micro-structure underlying Piaget's "control of variables" scheme. Data are presented which support the conclusion that young children are capable of acquiring and utilizing this scheme before they acquire Conservation of Weight, that is, providing (1) that the…