Most researchers continue to assume that one's self-concept is primarily governed by environmental determinants despite abundant evidence of the strong influence of genetic heritability. Ways in which the self-concept is developmental in the organism, particularly how adolescents' perceptions of personal, relational, and academic self-identity occurs uniformly across cultures and environmental circumstances, are explored in this paper. The study assumes that self-concept is both a part of the cognitive structure and is a construct of personality. Data were collected from a validated survey instrument (translated from English into Chinese and Russian), and self-reported perceptions of individual self-concepts were drawn from 301 Chinese, 105 Kazakh, and 75 American Indian adolescents. Results indicate a high uniformity among native adolescent groups, that is, perceptions that adolescents have of their conscious personal identity and its various components are relatively uniform across cultures and ethnic status. Though some individual variability was found among individual perceptions of cognitive structural components of personal identity, the evidence suggests that development propensities are at work in the formation of the self-concept. Contains approximately 120 references. (RJM)