In theory, the school principal is the head of school life, the guarantor of teaching, and the person in charge of the school. A job description that sounds like a boss with full powers. The reality is a more complex and atypical model. "Proviseure: rôle principal" explores the daily reality of the profession through the lives of three women, three school principals (a kindergarten principal in Marseille, a technical high school principal in Paris, and a middle school principal in Boulogne-Billancourt), showing that their mission is as central as it is ambivalent.