This article is centered in Competences Evaluation, in the points for making sense, and in those aspects considered as a menace for teachers about legitimacy and use of information taken from Evaluations. This teachers’ view becomes a possibility for showing how empirical information given by Evaluations designs the School and produces a real diagnosis of it, in order to make the Institution better, as well as articulating politics and people does. This study shows some vulnerability related to valuations, negative points of view, critics to evaluation and difficulties to relate it to Educative and Pedagogical Practice. Based on findings, we demonstrate to teachers the importance of accepting Evaluation in Educational Institutions as an option to improve quality in Education.