Scholars and students of international relations must contend with increasingly sophisticated methods for studying world politics. Models, Numbers, and Cases is a thorough assessment by the world's leading specialists of the three main approaches in international relations: case study, quantitative methods and formal methods. Clearly-written chapters address the most important methodological and theoretical issues in the field today, and demonstrate the practical application of these methods to three key subfields: international political economy, environmental policy, and security. The result is a model of rigorous methodological study and exacting substantive research. Models, Numbers, and Cases is a concise and valuable guide to the challenging terrain of contemporary international relations study.