The study is based on the hypothesis that there are forces of influence that push a group from extremism to terrorism. While not all groups make the shift to terrorism, there are inherent forces within the radical group that influence the course of action undertaken by groups. The study examines 10 radical groups in Indonesia and explores the question: How do ideology, leadership and group dynamics play a significant role in the radical groups in Indonesia? The study explored groups within a broad cross-section of terrorist and extremist groups that have either been in operation or are currently in operation in Indonesia The groups examined were Lashkar Jihad (LJ), Jemaah Islamiyah (JI), Darul Islam (DI), Front Pembela Islam (FPI),...