From this user's activity trends graph, we can see that about two weeks after the course began (at around Aug 15th ), he increased his level of participation - adding comments (green) and taking notes (orange) on a regular basis. At some point, during course break (Oct 1st - Oct 15th), Hen's activity decreased a little - but not completely. Towards the end of the semester (starting the 2nd half of November), his level of collaboration decreased, however - he did remain engaged until the end of semester (end of November).