In a prospective, longitudinal study we examined the psychometric properties of the self-perception scales of the Berkeley Puppet Interview (BPI). A total sample of 97 young children were assessed with the BPI at 3 time points: preschool, kindergarten, and first grade. The BPI assesses young children's self-perceptions of their school adjustment in 6 domains: academic competence, achievement motivation, social competence, peer acceptance, depression-anxiety, and aggression-hostility. Results showed that 4 1/2- to 7 1/2-year-olds possess a multidimensional self-concept that can be reliably measured and that the BPI is sensitive to normative changes and individual differences in young boys' and girls' views of themselves. Support for the method's validity was derived from consistent and meaningful patterns of convergence between children's self-perceptions and ratings by adult informants--mothers, fathers, and teachers--as well as standardized test scores. In fact, in this study, the concordance between young children's self-reports and parallel ratings by teachers or mothers were consistently as strong as if not stronger than the concordance between mothers' and teachers' ratings.