Reports results of a study of the development of perspective-taking skills of 180 English children aged six through ten. Children first are able to represent the object nearest the observer, then before-behind relationships, and subsequently left-right relationships between objects. Questions Piagetian conclusions that perspective-taking ability…

Study investigated whether older adults were more reflective or regressive than younger adults regarding hypothetical and real-life moral judgements. Results showed no average stage level difference between the age or sex groups. (Author/RWB)

Describes the development of cognitive structure in adolescence as establishing isomorphism between subject and environment. Identifies two dimensions of stages in the development of individuals'"work structure," i.e., the network of relations existing between the individual and his work.