The ecumenical movement exists to make the unity of Christ’s church more visible and effective in the churches’ own lives, and in their common witness and service to the world. Since 1990 it has made remarkable progress in such areas as ecclesiology, worship, mission, prophetic witness, and service in global, regional, national, and local contexts. Not least, it has broadened its scope as new partners have come to the table. Churches, councils of churches, bilateral discussions, united and uniting churches, and church aid and development agencies have all contributed to this success. But while ecumenism is now embedded in the lives of many churches, it faces challenges posed by the churches’ declining resources, their growing focus on internal issues, and the general societal distrust of organizations beyond the local level. Notions such as mutual accountability may help the churches live out their ecumenical vocation.