The book explores the unique contribution of Pentecostal/ Charismatic mission from the beginning of the twentieth century. The first part considers the theological basis of Pentecostal/Charismatic mission thinking and practice. Special attention is paid to the Old Testament, which has been regularly overlooked by the modern Pentecostal/Charismatic movements. The second part explores the contributions and challenged unique to Pentecostal/Charismatic mission. The book concludes with a reflection on the future of this powerful missionary movement. The authors’ discussions often reflect their experiences as Korean missionaries in Asia.