This textbook—written by experts in the field—delivers a comprehensive, systematic introduction to homeland security Throughout the course of the book, particular emphasis is placed on three paradigm shifts in homeland security: the new role of so-called "big data" analytics for risk assessment in homeland security decision-making; emerging understandings of the "homeland security enterprise," a term used by practitioners to describe whole-of-government efforts to manage natural and man-made threats; and the growing recognition of how international affairs can influence and shape domestic security considerations.