Online discussions are an effective method used to enhance interactions among learners and the instructor. The study examined the differences in communication based on whether the discussions were instructor-moderated or peer-moderated and based on whether the classes consisted of undergraduate or graduate students. Results indicate that student classification had no significant effect on the level of participation in the online discussions. However, there were significant differences in the amount of student participation in the discussions that were moderated by their peers rather than the instructor. (Contains 7 tables.)