This book provides insights into the competitive strategies methodology. Andrew Marshall notes that policymakers and analysts can benefit by using an analytical tool that stimulates their thinking about strategy in terms of long-term competition between nations with conflicting values, policies, and objectives. The book also demonstrates the strengths of the competitive strategies approach as an instrument for examining U.S. policy. The method focuses on policies regarding the proliferation of weapons of mass destruction. In shaping the international environment in the next millennium, no other national security issue seems as complex or important. The imperative here is to look to competitive strategies to assist in asking critical questions and thinking both broadly, as well as more precisely, about alternatives for pitting U.S. strengths against opponents weaknesses in global, regional or interstate competitions. Part I suggests that the competitive strategies approach has value for both the practitioner and the scholar. Part II uses the framework to examine and evaluate U.S. nonproliferation and counterproliferation policies formed in the final years of the 20th century. In Part III, the competitive strategies method is used to analyze a regional case, that of Iran.