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In this study we present the results of the adaptation of the Adolescent Self-Regulatory Inventory (ASRI) to Portugal. The measure was used with two samples of high school students to which ASRI was administered with Self-Regulation Scale as control measure. In the first study the measures were administered to 823 adolescents and the construct validity analysis was assessed with exploratory factor analysis. The results allow us to find an adequate structure with proper psychometric properties, in their construct and content validity, and reliability. A second study involved 435 adolescents, being tested three models using confirmatory factor analyses. The final version of the ASRI-2 presents an acceptable fit of the data in construct and concurrent validity, given its moderate or high correlation with academic success and substance use. The implications of this new approach to the self-regulation study are discussed and directions to further studies are suggested.