One of the problems of online earning is that it can be a very solitary activity. Educators have addressed this problem by creating cohorts - groups of people who travel through the course together. In the physical world, this is easy: set a class time and place. Online, it is more difficult, especially if you are dealing with large numbers of students. People learn at different speeds. People participate at different levels. These can lead to a single person being the only active learner in their cohort. So it's a conundrum.
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