Peter Neumann of ICSR @ Kings College is a SME on this topic and a few weeks ago OSCE published a report he prepared for them. He explains in the summary what it contains:
This report provides a summary of my findings. It seeks to (1) define key concepts and major dynamics; (2) evaluate the OSCE’s current and future role; and (3) identify areas of good practice, with particular emphasis on preventing and countering processes of violent radicalisation.
Link to summary:http://icsr.info/2017/09/icsr-insigh...s-osce-report/

Not read though. The full title is Countering Violent Extremism and Radicalisation that Lead to Terrorism: Ideas, Recommendations, and Good Practices from the OSCE Region.