Topics related to intergovernmental relations (IGR) inform various aspects of Forum programming. In federal and multilevel systems, various models of IGR mediate, modify, and clarify “who does what” within a system of governance. Regardless of which particular IGR model or structure is implemented in a federal or multilevel system, substantial interaction between orders of government is unavoidable. The management of IGR is of critical importance for the functioning of governance as IGR is driven by a range of factors including constitutional ambiguity, fiscal relations, public policy interdependence, investment and trade, infrastructure management, environmental protection, policing and security, and resource sharing. Building on previous work in the area, the Forum continues to structure programming around topics including coordination, “horizontal” vs. “vertical” IGR processes, joint projects and bodies, mechanisms for dispute resolution, agreements between orders of governments, and political accountability.