I’ve written a post on the GatherContent blog about pair writing:
Pair writing is a technique for collaborating on content in real time. Instead of exchanging drafts or correcting with a red pen, two people sit down together to write. You can use it to help content specialists collaborate with subject matter experts, or to include managers in the writing process, or to get input from colleagues when you need help. It builds understanding and trust, speeds up publishing processes, and creates content that meets user needs.