I will graduate in December with B.S in Computer and Information Science. I did the 2nd half of my degree primarily with on-line classes. In my experience, on-line courses are much more time consuming than classroom classes. Yes, you can take 12-15 credits and work full time. But, you will work just as hard if not harder than if you were taking all four classes in the classroom.
As someone mention earlier, make sure to school you pick is fully accredited.
