Tested construct comparability across adolescence with over 600 White girls (10.5 to 18.5 years of age). Assessed emotional functioning, eating problems, self-reflection, self-image, and mastery/ adjustment to examine meaning equivalence in self-concepts and developmental psychopathology. Performed maximum likelihood confirmatory factor analyses (MLCF) to see which model fit the data best and whether the behavioral constructs were comparable in Grades 7-8, 9-10, and 11-12. A 5-factor, but not a 1-or 3-fector solution, provided an adequate goodness of fit. The pattern of salient loadings was the same across the 3 grade cohorts, although the size of the absolute factor loadings differed somewhat. Results are discussed in terms of the importance of measure equivalence, the potential usefulness of the identified constructs for assessing change and continuity over the adolescent period, and, more generally, the applicability of this method (MLCF) to the study of measure equivalence across age periods.