Based on seven years of original research, this book contains one of the most detailed and comprehensive assessments of 'home-grown' Islamist terrorism (HGIT) in the US and UK to date. Beginning with an examination of the development of militant networks during the 1980s and 1990s, it traces the origins of HGIT and highlights the significance of these early experiences in different countries for shaping the future trajectory of the threat. The book also examines the range of motivations for violent jihad in the West, suggesting a composite theoretical model that specifies three 'necessary'...