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Traditional reviews and previous meta-analyses of self-concept interventions have underestimated effect sizes by using an implicitly unidimensional perspective that emphasizes global self-concept. In contrast, this research employed a synergistic blend of meta-analysis and multidimensional construct validation to evaluate the impact of self-concept interventions for children in 145 primary studies (200 interventions). Overall, interventions were significantly effective (d = .51, 460 effect sizes). However, in support of the multidimensional perspective, interventions targeting a specific self-concept domain and subsequently measuring that domain were much more effective (d = 1.16), suggesting sole reliance on global self-concept is inappropriate for evaluating interventions designed to enhance a specific component of self-concept. Other moderators (e.g., feedback, experimental design, target population groups) also …