Concerns with persistent self-stereotyping by adolescents about academic ac
hievements and body image focus attention on sources of self concepts. A se
lf categorization approach to self concepts highlights a sense of individua
lity at a personal level, and a sense of belonging at a social level. This
study investigates developmental trends in these social aspects of self kno
wledge for adolescent girls and boys (N=461) 11 to 17 years old. Results su
ggest that Individuality and Belonging are separate constructs, with consid
erable variability among adolescents. On average, a sense of individuality
seems stronger for older adolescents and a sense of belonging seems more mo
derate for older adolescents. The implications are for individual differenc
es as well as age-related variations in the personal and social basis of ad
olescent self concepts. (C) 2000 Elsevier Science Ltd. All rights reserved.