The American Society for Church Growth (ASCG) is an international organization which provides a professional network for those individuals or organizations associated with the Church Growth movement.
The society was founded in 1986 by Donald McGavran and C. Peter Wagner, and is currently led by president James Cho.
The ASCG defines church growth as follows: Church growth is that careful discipline which investigates the nature, the function, and the health of Christian churches, as they relate to the effective implementation of the Lord's Great Commission to make disciples of all peoples (Matthew 28:19-20).
In 1991 the ASCG began publishing the Journal of the American Society for Church Growth (JASCG) annually, and in 1997 this became thrice yearly.
It has since been renamed the Great Commission Research Journal and is published by Biola University twice yearly.