“Rapid reproduction indicates that several healthy dynamics are present in the movement:

1. The movement has gone beyond the control of the missionary or any other outsider. 
2. The movement has its own internal momentum. 
3. The new Christians passionately believe their message to be so important that it must spread rapidly. 
4. The harvest fields are confirmed to be ripe unto harvest. 
5. All the elements that are foreign to the church – and not easily reproduced – have been eliminated.”

From Church Planting Movements, David Garrison (loc. 2990-2998)