This book addresses how to conduct policy analysis in the field of national security, including foreign policy and defense strategy. It is a philosophical and conceptual book for helphing people think deeply, clearly, and insightfully about complex policy issues. This books reflects the viewpoint that the best policies normally come from efforts to synthesize competing camps by drawing upon the best of each of them and by combining them to forge a sensible whole. While this book is written to be reader-friendly, it aspires to in-depth scholarship.