Different academic models:
University of Phoenix model 
Courses are one month, when the students time devoted just to one course. Instructor provides weekly feedback to all students. Discussion is stimulated by instructor and is on an NNTP server which is accessible via outlook. Most professors are adjunct faculty. Tuition is $1000 per student with the faculty getting about $1000 in the end. Student evaluations done at the end.
- Uses only non-proprietary software
- High student interaction
- May not be suitable for situations where learning requires time for information to seep in or where students have radically different levels of preparedness.