In France, the Region of Lorraine is currently implementing a Virtual Learning Environment in his secondary school. But the arrival of such tool changes existing practices. So we are led to understand: what drives people to use it or not and how is it used. We make the following hypothesis that using a VLE in the daily practices is linked to a set of variables which are considered as predominant by users. Based on individual perceptions, ergonomic and social considerations, we plan to create our own acceptability model of a VLE, to explain and predict its uses in a specific context: the secondary educational community.