Description: This Toolkit for Social Workers has been developed for professionals who are working with underprivileged youngsters at risk of radicalization. The toolkit provides a brief summary of the theoretical background of radicalization and describes the main current streams of radicalist movements in Europe. The aim of the toolkit is to support social workers in the process of recognising youth who are on their way to radicalization and to present ready to use activities supporting the prevention of radicalization with a special focus on cognitive biases.