This collection of essays stages a dialogue between Friedrich Schleiermacher and Alfred North Whitehead on significant features of 'open' system. The volume offers new options for rehabilitating system for future theological and philosophical thinking by opening system to a flexible relation with changing reality. Key ingredients for system are discussed in three areas of contact between Schleiermacher and Whitehead. One such ingredient concerns historical precedents figuring crucially in Western systematic philosophy. Another feature is the systematic categorization of experience that relates epistemology, metaphysics, and the empirical sciences. System is also brought to bear on pressing contemporary issues, such as ethics and religious pluralism.