This chapter lays out the argument that constructivism is fundamentally a social theory of the mechanisms at work in global politics, rather than a political theory of what, in international politics, constitutes “good” and “bad.” Constructivisms provide a set of tools that can inform understandings of the substance of global political structures and decisions about how it is possible to maintain or change political structures, but constructivisms cannot by themselves inform decisions about the desirability of particular political structures. Constructivisms, as social theories, can only meaningfully inform the practice of international politics in combination with some political theory, understood as a theory concerned with the “ought” when constructivisms are concerned with the “is.” Constructivisms as such are no more “naturally” wed to critical theory than they are to realisms, liberalisms, Marxisms, or any other political theories.