Since its origins in the 1950s, European integration has entailed the creation of institutions whose rationale is to advance and maintain certain policy ends, notably the ‘four freedoms’ of the common market. As this chapter argues, the effect is that policy commitments have tended to be privileged over procedural arrangements. Rather than self-standing entities that can be put to different ends, broadly on the model of the modern state, one sees institutions evolving with the policies, and liable to be side-stepped should they fail to serve those ends. A non-hierarchical constitutional structure does little to inhibit these restructurings, indeed arguably gives further encouragement. The ideas and practices of emergency become ways to galvanize action, coordination, and innovation across a diverse and potentially recalcitrant institutional field.