This introductory article to the symposium first presents and then critiques the protean power concept of the Katzenstein and Seybert volume. Although the volume underestimates the value of rational choice models to explain some cases of protean power, it rightly demonstrates that our conventional theoretical toolkit insufficiently anticipates many such disruptions. Drawing on the examples of post-World War I veterans' movements and India's 1998 decision to test nuclear weapons, I argue that the protean power research agenda should focus on the reciprocal relationship between radical uncertainty and psychological and behavioral rigidity.
