The aim of this study is to provide an answer to questions such as: What is it that makes radical movements break down? Why is it that a violent course of action is renounced at a certain point in time? Why do some people leave their radical group? Because of the fact that Islamic forms of radicalism are receiving a great deal of attention, and this phe-nomenon has, until recently, been relatively unknown in the Netherlands, we endeavour, in particular, to make assessments with regard to a possible decline in this phenomenon. We address the topic of possible deradicalisation of Islamic forms of radicalism in the future and discuss how this process of deradicalisation could be supported if required., The aim of this study is to endeavour to provide an answer to the above questions. For this purpose, various examples of deradicalisation in the recent past in the Nether-lands are compared. On the basis of this comparison, we attempt to draw conclusions about deradicalisation in general, and about the possible future deradicalisation of Islamic radicalism in particular.