Action-Research Methodology and gender sensitivity linked to solve gender violence expression in prisons. The curriculum negotiation is a principle that allowed prisoners to engage in the activities in a voluntary way. Six months of field qualitative implementation-contrary to Blitzkrieg Ethnographyallowed us to get a real change of abilities as team trust, cooperation skills, decision-making process to avoid violence and to recognize the need the prisoners have to express their sentiments. Results show a success of critical Action Research and active participation of all the actors as well as the construction of a peace culture and a new field of work for pedagogues.