In most European countries, there is a great need for further education and competence development of professionals supporting young people with violent behavior. To fulfill this need, innovative approaches based on quality guidelines are required. In a comparative research-practice transfer project, partners of Germany, France, Poland, Sweden and Switzerland co-operated for two years to implement and evaluate two different strategies for further education based on the quality criteria developed in a previous study. These quality criteria aim at improving co-operation between different help systems, describe necessary changes in professional attitudes and methods and present more effective strategies for institutions to support young people with violent behavior. The project has resulted in a validation of such pivotal criteria, and driven forward recommendations for the implementation of competence development measures.