Research in the field of terrorism has increased dramatically since 9/11, responding to the sudden need by policy makers, journalists and the general public to understand terrorism. A unique feature of this field of research is that it expands beyond typical academic categories such as macroeconomics, development studies, international relations or peace science, instead, a range of analysts have applied their various skills of different sub-disciplines to a common theme since 9/11, providing inter-disciplinary insights characterized by a clear focus.