To what extent is International Relations theory useful for policymakers and practitioners in dealing with change in world politics?

International relations theory is a composition of various thoughts and theoretical schools developed since the end of the 19th century, aiming to establish a framework for analyzing international relations. As the post-war regime and globalization have rapidly transformed international relations, international relations are essential for establishing national and global policies. This article will analyze the three classic international relations theory schools of realism, liberalism, and constructivism one by one to explore how these theories can achieve global peace and the stability of the international system.