Current theories of learning have emphasized the value of dialogue for student engagement and achievement (Cazden, 2001; Bruffee, 1992). Research has also shown that the nature of classroom discourse depends greatly on the teacher (Anderson, Rourke, Garrison, & Archer, W., 2001). These issues are relatively well understood in face-to-face classrooms. However, the advent of online learning has raised more questions about student interaction and the role of teachers in such contexts. We need to develop a better understanding of how teachers can provide effective online mentoring and scaffolding to facilitate student engagement with each other and with their subject matter (Bonk, 2003). Perceptions of online teachers ’ roles in distance e...