What determines the occurrence, the scope, and the timing of major changes in foreign policy? In approaching this question, the author focuses on the “stabilizers” of foreign policy-that is, on the factors blocking, reducing the scope of, or delaying adaptation to new conditions, learning from negative feedback, or change in response to other disturbances. A framework for the analysis of stability in foreign policy is proposed. Several hypothetical stabilizers of foreign policies are discussed; they are grouped into administrative, political, cognitive, and international categories. Finally, the framework is applied to the problem of East-West detente.