International audienceOur work, produced by intervention-research in difficult environments, focuses on devices of fight against educational inequalities, reveals the issues finded by teachers, faced with profession changes, with challenges and dilemmas experienced in difficult environments. Teaching work’s analysis may operate remedies in view of the doubts, by a collective exploration of what is right or wrong, effective or not, and could contribute to training ressources.Nos travaux issus d’interventions-recherches en milieux dits « difficiles » se focalisent sur les usages des dispositifs visant la réduction des inégalités scolaires. Ils permettent de comprendre l’activité laborieuse des enseignants et des personnels éducatifs faisant f...