The exploitation of user’s interaction historic allows different level of experience’s return and for different kind of users: experience return for teachers, student, group of students, TEL designers,…

Two facets of the research are addressed: 1) Integration of a Trace Based System as a new component for TEL systems design (integration in a framework as Moodle for example); 2) Building a set of Trace models well suited for the target application which is chosen for its big interactivity ( typically for collaborative learning). This set of models addresses learner himself as well as the full group in order to discover some behaviours as collaboration, which are not visible from the user alone. Genericity and ability to integrate the set of models as designed for a target application will be criteria for testing research results in the Constantine University.