Rational choice is the dominant theoretical approach in political science in North America and one of the main contending approaches elsewhere. This major new text provides a clear and accessible introduction assuming no prior knowledge and providing a uniquely fair-minded assessment of both the strengths and limitations of the approach. Truly international in scope and in its choice of examples, it provides broad-ranging coverage of the areas in which rational choice has been widely used and in-depth coverage of the main works of its key protagonists.