Summarizes the major forms of cross-cultural research on personality development and discusses their contribution to developmental research. Also discusses some major issues in research on acculturation. (Author/SS)

Peer relations contribute substantially to both social and cognitive development. The essentials of friendship are reciprocity and commitment between individuals who see themselves more or less as equals. Affiliation and common interests, the main themes in friendship relations, are first understood in early childhood. Friends serve as emotional…

The author discusses major theories and developments over the last 30 years in three areas of developmental psychology: cognitive development, first language acquisition, and personality. He also comments briefly on methodology in the field. (SJL)

This paper reports the results of an ongoing study of individuals' ego control and ego resiliency. The study began with 130 subjects in 1969 when the subjects were in nursery school. At the most recent assessment, 104 participants still remained. Ego control is defined as the degree and kind of control individuals exert over their impulses, and…

Reviews research on the heritability of intellectual factors, personality factors, and psychopathology. Discusses the importance of investigating within-family environmental differences in order to understand the environmental origins of individual differences in development. (Author/BJV)