At least since the Islamic Revolution in Iran in 1979, and even more so since 11 September 2001, the world has had profound concerns about Islamism. These concerns centre on terrorist attacks, on the prospect of large areas in Syria, Iraq, North Africa and Afghanistan coming under the control of Islamists, and on surprising election victories for Islamist parties. Tilmann Seidensticker explains the differences between the Muslim Brotherhood, the Salafists, the Wahhabis, the Taliban and other groups, the thinkers whose ideas they draw on and the methods they use to achieve their goal of an Islamic politics and society. This definitive work is now available in a revised and updated new edition.