In 2015, GCTF Ministers launched the Initiative to Address the Life Cycle of Radicalization to Violence. This cross-cutting “Lifecycle Initiative”, co-led by Turkey and the United States, aims to equip policy-makers and practitioners with conceptual tools they can apply at various points of the life cycle of radicalization to violence: from prevention, to intervention, to rehabilitation and reintegration. In order to make the tools accessible and useful to stakeholders, the Lifecycle Initiative Toolkit was developed in 2016, intending to give policy-makers and practitioners access to consolidated information on the GCTF and related Good Practices documents, program models, research, and other counterterrorism and countering violent extremism resources. Next to the web-based version, a Lifecycle Initiative Toolkit mobile application for iOS and Android was created in 2017. Feedback on the Lifecycle Initiative Toolkit from practitioners in the field can be sent to the GCTF Administrative Unit (adminunit@theGCTF.org).