The ecumenical movement, symbolized by the Greek term 'oikoumene' meaning 'entire, inhabited world', aims to create unity amongst the many denominations that make up Christianity.
The ecumenical movement sees its mandate in the prayer of Jesus for unity in John 17:21.
Prior to 1054, there was a great deal of unity but also schisms in the Christian Church.
Since 1054, the Christian Church has developed widely different practices and theologies due to the reformation and subsequent splintering in Protestantism.
The World Missionary Conference (WMC) brought together 1200 missionaries from 160 missionary boards in an attempt to build cooperation.
The slogan of the World Missionary Conference was 'doctrine divides but service unites'.
The World Missionary Conference was solely an evangelical Protestant event, neither the RCC nor Orthodox Churches were invited.
The World Council of Churches (WCC) was formed as a result of the World Missionary Conference.
The World Council of Churches first met in Amsterdam in 1948 with 351 delegates from 147 church bodies, defining itself as a 'fellowship of churches' and described by outsiders as an 'ecclesiastical United Nations'.
Today, there are 350 church bodies involved in the World Council of Churches, including Orthodox, Anglican, United and many other Churches.
The Roman Catholic Church is not a member of the World Council of Churches, but it participates in two subgroups with full voting rights: The Faith and Order and World Mission and Evangelism Commissions.
The World Council of Churches defines its mission as 'visible unity of the Church' which includes striving for a common confession, sacramental life, mission and service.
Three main areas of work of the World Council of Churches are Unity, Mission and Ecumenical Relations, Public Witness and Diakonia, and Ecumenical formation.
The World Council of Churches' Ecumenical Institute at Bossey, near Geneva, acts as a centre for ecumenical formation.