Our research concerns teaching assistant systems by treating the question of reuse and exploitation of learners' profiles by the teacher. We propose also that other actors of the learning situation, learners and institutions, benefit from the exploitation of these profiles. In PERLEA project, we want from one hand to model the students' tracking process, and on the other hand to propose an environment giving software tools to help actors to reuse and exploit profiles of all disciplines, whatever their level. In this paper, we first define the concept of student's profile, necessary to present PERLEA project, theoretical framework of our work. We then present EPROFILEA environment, developed from PERLEA results. We illustrate this paper with a scenario of profiles reuse and an experimental device implementing the different steps of EPROFILEA project.