[…] the focus on “completion rates” in MOOCs is somewhat misplaced, as open education is not simply an extension of traditional education. As several others have noted, not every student is attempting to complete a course, and in fact different students have different goals while participating in the same open course. This holds true for both cMOOCs and xMOOCs. … The challenge, therefore, is to move beyond the simplistic view of one type of student with one type of goal (course completion), and find patterns of student behavior that will give additional insight into the different goals and therefore different measures we should have in evaluating whether MOOCs are effective.
Via Peter B. Sloep