The concern with conflict in our schools has increased in recent years. For this reason, initiatives aimed at dealing with conflicts like educational mediation have emerged. The goal of this study is to evaluate the usefulness of the M-Educa programme in its student training phase via an evaluative study of the pre- and post-measures of the CUVE[superscript 3]-EP questionnaire on school violence administered to 118 students in the fifth and sixth grades of primary school at a public school in the region of Madrid, and to analyse the records of the mediating students and the interviews of the tutors involved. The main conclusions of this study are that administering the M-Educa programme has had positive effects on coexistence at this school and was especially useful in the perception of the overall reduction in violence in the classes where most mediations took place. Specifically, it had the greatest repercussions on lowering the levels of verbal and physical violence, as well as social exclusion. [Translation from Spanish by Mary Black.]