Schools are responsible for civic education and for educating the students so they may live together. This means that they need to develop educative processes that take into account the social and affective dimension of the classroom, such as improvements in the atmosphere at school and the quality of teacher-student relationships. Practical strategies are required to carry out these procedures. Foremost among these strategies is mediation as a conflict resolution procedure in school. This also promotes a wide range of emotional, socio-cognitive, and socio-moral skills, and can be influential in the development of effective civic behaviour to improve the community. In this study we present and analyse the results of a study conducted in 13 schools in Navarre, Spain, with 50 teacher mediators, 33 peer mediators, and 23 student participants aged between 13 and 18 (x-bar =1 5.27 and s = 1.543), all of whom are involved in mediating processes, in order to perform mediation in a systematic way with the objective of bringing about socio-moral improvement.