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This paper presents a transversal study with a predominantly qualitative methodological profile that describes the evolution of academic self-concepts during adolescence. The sample consisted of 150 young people from various schools in the state of Sinaloa: fifty students per age group (twelve, fifteen, and eighteen years old), divided equally between males and females. Three instruments were used: a) a Piagetian critical clinical interview, b) self-concept questionnaire form 5, and c) profile of self-perceptions. The results show that change undergone in the academic self-concept has a flexible nature during adolescence and decreases at age fifteen; as in other studies, no differences by gender were seen. In spite of their provisional nature, the results may serve in the design of strategies that contribute to configuring adolescents' self-concept, that improve their performance as students, and that stimulate their personal development. [ABSTRACT FROM AUTHOR]