Center For International Affairs, Harvard University

This non-fiction work blends political psychology with international relations to show how decision makers perceive information, how cognitive biases shape choices, and how misperceptions influence global affairs. Its central aim is to illuminate why leaders sometimes misread opponents or overestimate their own power, and to offer a rigorous framework for analyzing state behavior. The audience includes thoughtful students, researchers, and policymakers who seek clear, evidence-based explanations of complex political dynamics. The tone is insightful and purposeful, inviting readers to question surface readings and cultivate a disciplined approach to world events. The content is presented through a clear theoretical framework paired with concrete historical case studies drawn from 19th- and 20th-century Europe to test ideas against real outcomes. The latest edition adds an extensive preface that reflects forty years of psychological research and considers the ongoing relevance of perceptual dynamics in contemporary decision making. The prose is precise yet approachable, delivering rigorous analysis without sacrificing accessibility. Key concepts include how people process history when forming expectations, typical misperceptions that influence policy choices, and the ways in which leaders learn from the past. The reader will encounter case-based analysis that demonstrates how per