James Mark Baldwin is one of the most important and least known early American scientific psychologists. Drawing inspiration from Charles Darwin and other evolutionists of the period, Baldwin developed a biosocial theory of psychological development that influenced both Jean Piaget and Lev S. Vygotsky; and he proposed a mechanism relating learned…

A social development theory of self is introduced as a framework for developmental psychopathology. Built on some of Piaget's principles, the theory is taken into the social domain and used to define the movements of self and important others throughout life. (PCB)

Proposes a new theory of self, based on the principles defined by Lawrence Kohlberg in his theory of moral development. The model sets forth self complexity (schemata) and biography (themata) as dimensions of self. Describes normal and atypical development arising from interaction of these components and assesses implications for practice. (KO)