Globalization presents a number of problems for Political Science. This is because the various trends, processes and structures usually lumped together under the heading of globalization are not linear or commensurate. They are asymmetric conglomerations of a range of quite different processes, with different structural characteristics and different dynamics, which intersect and interact in complex and circular ways. In this sense, it is always possible to deny that "globalization" exists, by merely showing that some trends point in the opposite direction, or that some preexisting structures and processes are "enduring" in the midst of other changes, or that these different processes do not blend empirically or normatively into a coherent whole.