Despite the existing national and international plans of action to end violent discipline strategies used by teachers in schools, they still prevail in Tanzanian schools. This underlines the need to implement school-based interventions that aim at reducing violent discipline by teachers. In this study, we will evaluate the feasibility and effectiveness of the preventative intervention Interaction Competencies with Children – for Teachers (ICC-T) in Tanzanian primary schools. Following its success in secondary schools, we hypothesize that the intervention will reduce teachers’ positive attitudes towards and their use of violent discipline at school.