The diffusion of internet is not to foresee anymore, it is there. Enterprises, and individuals in particular, are now familiarized with this new media and youngsters develop a new culture that complements and nourish the « new economy». Teaching is also taking this new turn under different names: on-line teaching, distance learning, tele formation, etc.. One can note three factors that are going to sustain the development of « distance learning »( Carton M, Tawil S, 1997) :