Charles, One way some do it is to ignore the importance of student interaction and just have students read a textbook and complete online multiple choice questions on online quizzes. Others might use a pre-built (textbook vendor supplied) training/assessment system such as those for Microsoft Office courses where the computer provides tutorials, assignments that are autograded, and quizzes. Everything is automated and the instructor just answers questions (more like tech support). Even then, many times TAs are necessary to help too. Certainly not the interaction you can get with a class of 15-20. Herbert Brown III