Résumé
This text focuses on the epistemic part of teachers' practices and the collective dimension of their praxeologies. Considering what brings together and founds the common identity of teachers of a given school discipline, four founding concepts of the anthropological theory of the didactic are used: object, relation/relationship, institution, person. The notion of ethos in sociology is used to define the epistemic ethos of teachers (Wozniak in Recherches en didactique des mathematiques 39:15-50, 2019) to articulate personal and institutional relationship. In a second part, the relation to modelling of French teachers is studied through the observation of the resolution of the same problem at different teaching levels. In this way, the study of the teachers' epistemological work reveals part of their epistemic ethos.