This paper reports a single-subject case study designed to investigate the role of group discussion in student learning. The group discussion took the form of contributions to a series of online discussion boards. And our analysis focuses on the contribution of one group member. We argue that this individual came to serve as a catalyst to learning for many group members because of the concomitant roles that she came to occupy.
Kannan, Jaya and John L. Miller. "Study of Connected Knowing in an Online Learning Environment." Journal for the Advancement of Educational Research 5.1 (2009): 101-112.