Abstract
The article analyzes the training of educators in the school environment through the “prevention battalions” scheme, designed to combat delinquency and school dropout in working-class neighborhoods. It highlights the collaboration between prevention educators and educational staff, revealing the confrontation between different professional cultures. This encounter generates tensions and requires adjustments in professional stances. The analysis shows that supported reflexivity and learning through practice foster a gradual evolution of professional practices. Feedback and reflection spaces allow professionals to express their difficulties and rethink their interventions. These dynamics extend the effects of research into the field. The field thus emerges as a genuine space for training and sustainable co-learning.
Keywords: french national education system, prevention educators, professional culture, training, working-class neighborhoods.

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