In the wake of the emergence of Social Constructivism, the development of International Relations theory has entered into a new phase. Researchers often address the subject in terms of the historical evolution of theories with reference to the Great Debates since Classical Realism-vs.-Idealism. As such, Social Constructivism, often regarded as a recent import from sociological perspectives, is commonly differentiated from (Neo)Realism and Neoliberalism. Among them, Neoliberalism is often tantamount to “new institutionalism” in International Relations.