The '200 barrier' is a very significant church size barrier. Most churches are unable to make changes to their community style and leadership style to go beyond this point.
Keller observes that the '200 barrier' may differ for cultures, communities and pastors. For example, white collar people tend to have higher demands of specialised resources, and so for centre-city churches, it may be the '100 barrier'. I suspect it's 7-100 for most places in Australia.
Tim Keller on church size transitions Part I
