This qualitative study explored asynchronous online discussions (AODs) in terms of: (1) whether students interacted effectively with each other, (2) how moderators facilitated discussions, (3) whether students achieved higher levels of thinking about discussion content, and (4) how students demonstrated engagement with provided learning resources. Results indicated that the level of thinking and the engagement with learning resources were low. However, moderators facilitated AODs differently in three aspects: follow-up, format, and time. The distinct features of one remarkable discussion case provided suggestions on how to develop other relevant studies and how to enhance the AOD activities.