The Edinburgh 2010 study process is unique. Set up to mark the centenary of the World Missionary Conference, Edinburgh 1910, it is a project of churches worldwide that is multi-regional, cross-denominational, and poly-centric. It involves all the major Christian world bodies, including Catholic, Orthodox, Protestant, Evangelical, and Pentecostal, with study events taking place on every continent and involving hundreds of Christians in different parts of the world. This volume, the second in the Edinburgh 2010 series, includes reports of the nine main study groups on different themes, which will be used as the raw material for discussions at the conference in June 2010. Their collaborative work brings together perspectives that are as inclusive as possible of contemporary world Christianity and helps readers to grasp what it means to be "witnessing to Christ today."