In content-heavy courses, across all levels, lecture is still the main method of content delivery. The challenge is: once you have a reasonably good lecture (say, 30 mins. long). What do you do? How do you transform your video lecture into a productive and effective learning activity? There are a few options, but this one is probably the easiest and best of them all.
"When my colleagues decided to refresh graduate-level courses for online delivery, I proposed that we should consider a simple, yet innovative and radical instructional design principle: that all course activities should not only be built using sound, published evidence that supports their potential for effectiveness, but that such grounding in published research for each activity should also be clearly articulated and made available to students!"