The causal attributions and dimensions and the academic self-efficacy permeated by the affectivity are fundamental for the school achievement of the undergraduate student. In this study, we evaluated the relationship between affectivity and academic self-efficacy of 115 students (39 from the Computer Science course, 41 from the Civil Engineering course and 35 from the Electrical Engineering course of the Federal University of Mato Grosso). A questionnaire with 10 questions was made using the

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... ert scale, where the first two questions assessed the interference of the previous contents on the learning of mathematical contents, three evaluated the level of student's academic self-efficacy, the other two assessed some origins of the beliefs of the student's academic self-efficacy, the last question evaluated the relationship between effort and academic self-efficacy, and questions 4 and 5, the focus of this research, directly assessed the relationship between affectivity and academic self-efficacy. The results pointed to a protagonist role of affectivity in relation to academic self-efficacy and a confirmation that the effort continues to be the highlight for students' belief in academic self-efficacy.