Similarities and differences between Erik H. Erikson's and Jean Piaget's theories concerning social development and the process of identification are explored in this report. The first part of the report is a synthesis of Erikson's concept of the developmental processes of personal growth and societal development. The second part integrates Piaget's theory of affective development and Erikson's theory of childhood psychosocial development. The third part compares major theories of identity formation, including: (1) the psychoanalytic conceptions of ego, self, and identity, (2) the theories of identity formation advanced by B. F. Skinner, Carl Rogers, and George H. Mead, and (3) the different conceptions of the relationship between self and society in these theories of identity. A reformulation of the concept of identity is suggested. (BRT)