The Military Intervention by Powerful States (MIPS) project develops a rigorous, generalizable measure of the effectiveness of military force as a policy instrument and applies the measure to code the outcomes of all military interventions conducted by five major powers since the termination of World War II. The MIPS dataset provides detailed data on American, British, Chinese, French, and Russian uses of military force against both state and non-state targets between 1946 and 2003. In particular, this project focuses on the political objectives strong states pursue through the use of force, the human and material cost of their military operations, and measures of intervention outcomes relative to the intervening states’ objectives. The dataset also includes extensive data on factors commonly hypothesized to be associated with war outcomes like the nature of the target, the type of force used by the intervening state, and military aid and assistance provided to each side.