Th e study of international mediation has long been dominated by single case studies or experimental approaches. Th is article argues for a more systematic approach and advocates a cross-national, longitudinal and empirical analysis of mediation based on actual historical data. Th e kind of information this approach can yield is invaluable in disentangling the structural aspects of mediation. Th is article presents the logic, rationale, and theory behind the most extensive data set on international mediation: the Correlates of Mediation Project. Data on all formal mediation events were collected for the period 1945-1995. Th e structure of the data and some important findings are presented here. Th e advantages of data analysis are discussed and future challenges and developments are noted.Mediation has long been one of the most popular methods of international conflict management. In the current political environment, where global forces impact on internal behavior in every sphere, where weapons of terror or mass destruction threaten every state, learning how to manage conflicts effectively and peacefully is an imperative need. Conflicts in international relations can be managed by violence, negotiation, mediation, arbitration, or various forms of United Nations (UN) interventions. Of these, the most promising, and in many ways most acceptable, method is mediation. It is a voluntary method of conflict