This classic work has helped shape the field of international relations and especially influenced scholars interested in how foreign policy is made. At a time when conventional wisdom and traditional approaches are being questioned, and when there is increased interest in the importance of process, the insights of Snyder, Bruck and Sapin have continuing and increased relevance. Prescient in its focus on the effects on foreign policy of individuals and their preconceptions, organizations and their procedures, and cultures and their values, is of continued relevance for anyone seeking to understand the ways foreign policy is made. Their seminal framework is here complemented by two new chapters examining its influence on generations of scholars, the current state of the field, and areas for future research.