Abstract: In one general aspect, a computer-implemented method can include scheduling a respective available open enrollment period for each of a plurality of cohort sessions for an online course, determining that a first cohort session included in the plurality of cohort sessions for the online course is open for enrollment, enrolling, based on determining the first cohort session is open for enrollment, a learner in the first cohort session, automatically tracking a progress for the enrolled learner, determining, based on automatically tracking the progress for the learner, that the learner is falling behind a predetermined schedule of course completion for the online course, and, based on determining that the learner is falling behind the predetermined schedule, automatically determining that a second cohort session included in the plurality of cohort sessions for the online course is open for enrollment, and enrolling the learner in the second cohort session.

Abstract: A method for augmenting or enhancing on-line course content includes displaying an on-line education course video to one or more viewers on network-connected viewing devices, receiving viewer annotations data including viewer annotations of video fragments, segments or frames of the displayed course video, and accumulating the viewer annotations data as annotation data records in in a searchable database. Each annotation data record includes annotation text for a respective video fragment, segment or frame of the displayed course video to which the annotation text applies. When a user query or search term has a match in the annotation text in an accumulated annotation data record, the method returns a search result based on information in the accumulated annotation data record including a link to the specific video fragment of course video to which the annotation text applies.