Three experiments involving balance scale problems were used to characterize and explain developmental differences in three domains of children's thinking: existing knowledge about the problems, ability to acquire new information about them, and process-level differences underlying developmental changes in the first two areas. (BW)

The work of Jean Piaget stresses the point that intellectual functioning and growth from one stage of cognitive development to the next depends more on the quality of one's experience than on exposure to factual knowledge. Piaget's theoretical model and its implications and applications for the classroom teacher are reviewed. (Editor/RK)

Children's understanding of Euclidian space was investigated using three Piaget-type tasks to examine the ability of children to quantitatively locate a point in one, two, and three dimensions. Among the findings were that a disagreement exists between Piaget's data and the results of this study. (BT)

This study examined the hypothesis that perceptual errors on a task requiring subjects to take different viewpoints could be explained in terms of response bias. Results were consistent with response bias hypothesis: making an egocentric error is different from behaving in an egocentric manner. (Author/SB)

Noting that the previous two decades have seen Lev Vygotsky's psychology become highly influential while the psychology of other theoretical giants has faded, this book provides a major intellectual biography about Vygotsky's theories and their relationship to twentieth-century Russian and Western intellectual culture. The book traces Vygotsky's…

Ethical development was investigated in a cross-cultural context by examining both the cognitive structure of ethical reasoning and the content of perceived moral norms in black Carib boys of British Honduras in the framework of stage theory. (Author/JM)

Reports the results of a study that indicate that junior and senior high school science students are penalized (by receiving lower grades) for not being able to think at the formal operational level. Outlines some methods that may be used to facilitate growth in cognitive development of students. (JR)

Author suggests that variations in the functioning of imagination result in variations in mental aptitudes and expressions and expressions, and these variations serve as a guide, according to which the scope of an individual mind may be recognized. (Author/RK)

In general, this cross-sectional validation study supports Inhelder and Piaget's claims about the development of concepts of volume and density more easily than younger subjects. (Author/WY)

The authors challenge proponents of informal open classrooms" as well as of traditional school organization. (Editor)