This thesis deals with the radicalisation of male youth by Islamic terror groups in Austria. The research question, which is: "Which dynamics lay behind the radicalisation of Austrian youths by the Islamic terror organisation IS, and what methods of social work can serve their prevention?", arose by reason of current events. The main concern of the thesis is to expose the dynamics behind the radicalisation and the recruiting of young men in Austria, by extremist groups such as the Islamic State, as well as shed light on the methods of prevention used by social workers. Therefore information from specialist literature was gathered and furthermore experts from different fields of extremism preventions where questioned by means of guided interviews. The analysis revealed that radicalisation is a complex process, in which the aspects of relations in the environment of the youth, the search for identity, and the sense of self-efficacy play a major role. Effective prevention is definitely possible and is pursued successfully by now but also frequently reaches its limits.