Hormone levels and changes in hormone levels were evaluated three times across a 1-year period as concurrent and predictive correlates of the socio-emotional functioning of 56 boys 10- to 14-years-old and 52 girls 9- to 14-years-old who represented the five stages of Tanner's criteria of pubertal development. The hormone measures were serum levels of gonadotropins, sex steroids, adrenal androgens, and corticosteroid. An additional measure was testosterone-estradiol binding globulin. The measures of adolescent social-emotional functioning were based on adolescent questionnaire and interview self-reports on psychological functioning (impulse control, emotional tone, body- and self-image, and self-esteem); social functioning (social relationships, morals, family relationships, and social competence); and anxiety, depression, and affective/neurotic symptoms. Concurrent hormone-behavior relations were more likely to replicate for boys than for girls. Concurrent relations were stronger than predictive relations for boys, but of similar strength for girls. The best predictor of social-emotional functioning at Time 3, for boys, was timing of maturation based on pubertal stage at Time 1 and, for girls, the rate of change in hormone levels from Time 1 to Time 3. (RH)