Our experience would suggest having Web course testing centers on campus. Professors could upload tests to the center, personnel could check I.D.'s and students could take their exams on an asynchronous schedule. Early on, it was clear that computer mechanics were going to be a huge obstacle. An introduction was given in person the first day and again a week later. This proved to be woefully inadequate.
Much more training is needed.
Indeed, in analyzing the email, bulletin board and chat room communications, there were almost no statistical questions during the first three weeks, only computer questions. By the seventh week, most of the students had the system well under control. In fact, they had very few problems understanding the statistics, just the computer. The midterm and especially final grades were very good. Perhaps computer troubles focused the usual panic over statistics onto the computer.