Finally taking the time to read James Farmer's article on incsub: Communication Dynamics: Discussion boards, weblogs and the development of communities of inquiry in online learning environments.
Did a quick skim, and he's referencing the book "E-Learning in the 21st Century: A framework for research and practice" that was put together by Randy Garrison and Terry Anderson. Randy is the Director of The Learning Commons, while Terry is up at Athabasca University, and was involved with the development of CAREO.
Small world ;-)