Piaget and Inhelder, in The Child's Conception of Space (1956), described the coordination of viewpoints (CV) spatial operation as one of the prerequisites to the development of the rotation and development (RD) spatial operation. This study investigated this developmental dependency notion and also evaluated the effects of age and sex on the…

Mothers', fathers' and teachers' perceptions of young children's five motor, gross motor, and language skills were scored as underestimates, hits, or overestimates. Comparisons yielded no differences between groups except mothers overestimated gross motor skills, and teachers underestimated fine motor skills more than fathers. Correlations…

The intense striving for power which characterizes much of male behavior occurs inevitably as part of the process of gender acquisition and consequently contributes to a sense of psychological vulnerability in the male personality. Masculine and feminine attributes develop spontaneously from young children's tendencies to compare themselves to…