The word koinonia has gained prominence in recent ecumenical discussions. In this original and substantial work Lorelei Fuchs proposes the theological idea of koinonia, commonly translated as "communion" or "fellowship," as the key to moving fractured churches toward a future unity. Fuchs challenges churches to move beyond mere dialogue and to apply ecumenical insights at the local level. She begins by relating the exegetical meaning of koinonia to its ecumenical meaning, tracing the place of koinonia both within the churches and between the churches. She then examines the concept of koinonia in the extensive and fruitful dialogues that have taken place between Lutherans, Anglicans, and Roman Catholics, finally articulating a "symbolic competence for communionality" that provides a rich and workable way forward for church unity at all levels. Encompassing the latest in ecumenical thought, Koinonia and the Quest for an Ecumenical Ecclesiology provides a broad, thoughtful framework for realizing Christ's prayer "that all may be one . . . so that the world may believe."