The increasing social diversity and pluralism of values, preferences, worldviews and ways of life created by ongoing technological, social, demographic and cultural changes are redefining contemporary societies and communities. These changes generate profound challenges to existing political and governance systems. Especially important are changes arising from migration and immigration, each of which promise to improve diversity and economic well-being yet confront resistance in some communities. Responding to these challenges requires a renewed effort to understand what kind of institutional arrangements and governance systems facilitate or undermine tolerance, peaceful coexistence and productive cooperation between individuals and communities at all levels—from the local to the international level—in conditions of deep pluralism and divergence of beliefs, values and preferences. This activity focuses on the philosophy, theory, institutional analysis, and design of “modus vivendi” governance arrangements, which support the conditions for “live and let live” social orders, in circumstances of deep pluralism and cleavages. To support this project, the Center will establish a working group of international scholars dedicated to the development of this agenda and position itself to become an international hub for the researchers in this domain.