Central to US foreign policy, the Strategic Defence Initiative (SDI) was launched by Ronald Reagan in 1983. While the Reagan administration failed to deploy the SDI system, it featured prominently in the relationship between the US and the Soviet Union. This insightful book examines SDI and the Reagan administration through an evaluation of the role of the SDI in the end of the Cold War. Presenting an extensive range of primary and secondary material together with interviews, the book will be welcomed by academics and upper level students interested in politics and history.