Closed Tutors Software or CTS are used in classrooms in many schools in mathematics. To analyze their potential role in the school, we have built a model based on the notion of institution, central to the Anthropological Theory of Didactics, defined by us, based on criteria of social reality, legitimacy, stability and specificity. To understand whether CTS can be used as an institution of teaching and learning, each of four software in our study has been fully inspected by an expert whose captures videos allow us some comparisons with the work of students our experiment. The decryption of all data was conducted using a software analysis of behavior, the Observer from Noldus. More specifically, with regard to mathematics learning, we chose t...