In this activity, lectures were indexed by topic and posted online so that students could re-watch segments on specific topics. In Math 23b, Professor Paul Bamberg offered students extra credit for indexing lecture. They would create a document giving the time breakdowns for each topic. This would then be posted on isites as a guide to the already-posted lecture video. Not only did this encourage students to re-watch lectures, but it led to the creation of a valuable resource that other students could draw on.
Here is an example from the first lecture.