The Second International Congress on World Evangelization, often called "Lausanne II" or "Lausanne '89" was held in Manila. The conference is noted for producing the Manila Manifesto, a renewed and expanded commitment to the Lausanne Covenant, an influential document in modern Evangelical Christianity. It was also here that Christian mission strategist Luis Bush first highlighted the need for a major focus of evangelism in the "Resistant Belt," covering the middle of the eastern hemisphere. Further research in mid-1990 led to the 10/40 Window concept, which contrasts the major needs and few resources devoted to this part of the world.