1. Multiple channels connect societies, including: informal ties between governmental elites as well as formal foreign office arrangements; informal ties among nongovernmental elites (face-to-face and through telecommunications); and transnational organizations (such as multinational banks or corporations). These channels can be summarized as interstate, transgovernmental, and transnational relations. Interstate relations are the normal channels assumed by realists. Transgovernmental applies when we relax the realist assumption that states act coherently as units: transnational applies when we relax the assumption that states are the only units.