This study investigated the question of how civil society groups cross political, cultural, social, economic, and language boundaries to find common ground and to act collectively in coalitions to effect international change. A set of constituents emerged in answer to the research question; Complementarity, Speed and Democracy, Rules of Engagement, Contingent Alliance, and Convergence. Convergence emerged as a central and unifying construct. Convergence is the uniting of people who are different, or even opposed, around a common cause. It is based on the presumption that diversity is critical to coalition success and that it needs be employed to leverage its many potential benefits. The analyses led to the conceptualization of the Convergence System, a model that employs global civil society (GCS) diversity to discern complementarity within GCS coalitions, to discover Points of Convergence, and to facilitate collective action toward shared objectives, thus enabling efficacious action by GCS within the international polity.