I think I’ve a way to deal with my large CS123 class: topic experts. Each group has experts in charge of mastering and teaching particular topics. For example, we’ve assigned pattern experts and C++ experts. This way, I can do study groups. We’ll meet every week. I’ll give them assignments, and they’ll share what they learned with their classmates.

Decision: One person per role. The topic expert is forced to pay attention, otherwise the whole group will have problems. The topic expert also learns to teach others. Different areas of expertise ensure division of work.