No one should be learning a life-supporting system on-line. The idea is ludicrous, and the fact that NAUI supports it surprises me. You cannot replace good instruction with a computer, you cannot replace in-class demos with a computer. As for the pool thing, the only classes I've helped with are run through school, and we do a minimum of 8 weeks in-water training (2 hours each session). This is coupled with 2 hours each week in the classroom. So I haven't been involved with abbreviated pool sessions, and I really don't believe in them. Not to say that we think you have to have 16 hours of pool time, we do a lot of other things in the pool that most classes do not offer and train students to do. (simulated night dive, blacked out mask work, situation handling exercises, etc. depending on time). I do feel that you need to have a minimum of 8 to 10 hours in the pool (for a class of 6 to 10) to get them ready for open water.
Anyway, point is, that you can't interact with a PC...you can try, but it really doesn't work
-TT