Many Middle East observers believe that social mobility and popular frustration are the primary motivators of Jihadi terrorism against the West. This new book by a distinguished sociologist shows that Jihadist ideology is paramount in the Jihadist movement. The author argues that understanding the power of ideology may lead to better foreign policy responses and a safer world. Based on translations and public communications from several languages, Khosrokavar offers a comprehensive understanding of Jihadi ideology in Sunni and Shiite traditions. He explains the perspectives of major Jihadist intellectuals and analyses the viewpoints of visible figures who popularise the ideology for consumption by Middle Eastern publics.