This Toolkit has been developed by IOM in collaboration with UNODC with the support of the European Union under the Mainstreaming Migration into International Cooperation and Development (MMICD) project. In the Toolkit, we explore how migration relates to the following sub-sectors: (i) security sector reform, (ii) transnational and organized crime, (iii) conflict prevention, (iv) stabilization. It provides practical information and tools to help development practitioners integrate migration into security interventions.