This class is designed to introduce representative theories of international relations to students and help them develop an analytical perspective on major issues in international security and international political economy. To this end, the class is divided into three sections. The first section reviews the process of formation and change of the international order, centering on Western Europe, and focusing on important historical events. The second section introduces representative theories that explain international relations, namely, realism, neorealism, liberalism, neoliberalism, Marxism, and constructivism. The third section examines international security, international political economy, and international organizations, human security, the natural environment, terrorism, and human rights.