In the writing of the thesis, the comments and reviews given and received to test the hypothesis of the student throughout its elaboration take on a special meaning. Indeed, this article analyzes the students’ perceptions of the comments and the support in the review given by the thesis directors, in order to identify what kind of comments are constructive and which are not. To achieve this objective, an exploratory method was used, using as procedure an interview of 10 master’s degree students who were in the final stage of the preparation of their theses, as well as a survey of 10 graduates, all of them belonging to Human Sciences majors.