Since its inception, the ecumenical movement has sought the unity of the church. A host of questions has arisen, however, about the doctrinal and practical aspects of church unity and about the meaning of unity itself. This volume, written to help us move beyond such questions, provides the first and only comprehensive study of the goal of church unity from the beginning of the ecumenical movement to the present day. Harding Meyer critically analyzes the perceptions and models of unity that have emerged over the years, taking into account the specific convictions of the individual churches and denominations, and offers his own provocative vision for the path ahead.