MeTAH main concern is to understand foundations and develop techniques for the design, development and use of Technology Enhanced-Learning (TEL) systems. TEL is considered as a proper scientific area (and not only as an application domain of computer-science or education), with its own issues. MeTAH attempts to understand how to take into account the required educational (didactics, pedagogy) and usage dimensions when considering the design of TEL artifacts such as computationally-represented learning-scenarios, TEL systems such as microworlds, intelligent tutors or collaborative environments, or TEL systems’ specific functionalities such as feedback. Issues are addressed by building on, articulating, meshing and/or developing methods and techniques issued from the computer-science and education disciplines. MeTAH has a strong design and implementation orientation, with experimentation-based re-engineering. The group’s computer-scientists are particularly focused on (1) participating to the multidisciplinary conceptualization of these issues and (2) studying computer-science approaches to be used, adapted, extended or developed to tackle them. The group’s education-oriented scientists are particularly concerned by (1) participating to the multidisciplinary conceptualization of these issues and (2) studying the impact and usage of the elaborated propositions within a perspective of engineering and re engineering systems (by opposition to only considering their usage).