Abstract
This research is interested in the teaching professionnality, under consideration through together mobilized professional competences, under the double point of view of activity and identity. It is centered more particularly on the taking into account of the diversity of the pupils in class of nursery school. The study of teaching very tested in this level of schooling was carried out on a one year scale. The results underline principles which organize the action and of the professional gestures articulated with strongly asserted values. They reveal an identity dimension built in various professional and personnel spaces that the teaching mobilizes to give direction to its action.