There are two well-known approaches to the study of international relations: Realism and Idealism. This book explores the writings of Inis L. Claude, Jr., a preeminent scholar on international relations, to define a third approach. Pragmatic liberalism, an "in-between" approach, argues that a liberal world order can be sustained and promoted by the pragmatic application of liberal principles. It rejects both the over-pessimism of Realism and the over-optimism of Idealism while refusing to maintain that the anarchic nature of the international system is unchangeable or even that we can change it overnight. However, it is possible to eventually improve the international system. This melioristic approach to world order and international relations can be explained through the sophisticated writings of Inis L. Claude, Jr., who has remained a celebrated scholar and an example to students of international relations everywhere for over a half century.