Paul Atwater and Wesley Roberts write up a summary of their experience: 'The biggest surprise of 2005 for both Peoples Baptist Church of Boston and North River Community Church in suburban Pembroke, Mass., was the joy and exponential results from our decision to partner with each other during two side-by-side 40 Days campaigns.'

They identify 10 keys that made the partnership work.

1. Start with a pastoral friendship.
2. Develop a heart for your community.
3. Dive into exponential thinking.
4.  Practice mutual respect and humility.
5. Get your own campaign.
6. Empower teams and get out of the way.
7. Serve first, and then answer questions.
8. Remember that money follows vision.
9. Work together and have fun together.
10. Find ways to tell the story.