Peer mediation is an excellent way to establish a nonviolent atmosphere at schools which helps to avoid conflicts already before they arise. It refers to the measures of intervention that are taken in case of existing conflicts between adolescents by their peers. Finding a solution to the great number of conflicts the students face at school requires a training as peer mediators. The skills they are picking up can be helpful in private situations and in professional contexts as well. The development of these skills is, especially in vocational schools, desirable. The aim of this diploma thesis is to present the training of students at secondary vocational schools who want to become peer mediators, in detail. Therefore, the terms 'conflict' and 'mediation' are described in first place. Secondly, the requirements that need to be fulfilled by the actors playing a significant role in the process of putting peer mediation into practice are shown. Thirdly, the training of the students is specified and explained more closely. In conclusion, an example of one unit of training is given.The institution of school, the peer coaches and peer mediators are the most important actors in realizing peer mediation. The institution has to substantially and insubstantially support peer mediation. Peer coaches are qualified teachers, who train the students and coach the peer mediators for longer periods. The training has to be planned, accomplished and evaluated according to the Deming wheel. The results of the evaluation are integrated in the next planning to make sure a continuous improvement of the peer mediation process.