This study concerns the relationship between friendship variables and adolescent psychosocial development, in particular identity and psychosocial intimacy as envisaged by E. Erikson [(1950), Childhood and Society, New York: Norton; (1968), Identity: Youth and Crisis, New York: Norton. Two hundred and twenty-three secondary school and college students were surveyed regarding friendship networks, beliefs about friendship, functions of friendship in general, and aspects of a best friendships. Intimacy and identity measures were obtained using the Erikson Psychosocial Stage Inventory [D. Rosenthal, R. Gurney, and S. Moore (1981), "From Trust to Intimacy; A New Measure for Examining Erikson's Stages of Psychosocial Development," Journal of Youth and Adolescence, VoL 10, pp. 525-5371. Four developmental style groups (Dual High Scorers, High Identity, High Intimacy, and Dual Low Scorers) were formed from these measures. There were no differences between the sexes in their choice of developmental style. Those in the high-identity-high-intimacy and the high-identity-low-intimacy groups were more satisfied with their friendships, which appeared affectively richer. Sex differences showed that while friendship variables were more strongly associated with development for boys, girls viewed their relationships as closer and ascribed more importance to this closeness.