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In this chapter, the author discusses two graduate online courses and the use of the online discussion boards specifically as they were used for problem-based learning. In the first course, the instructor scaffolded the learning more closely by providing a specific case to be solved by students and by providing specific instructions. In the second course, students were in the field tutoring and were to use the online discussion board as a place to bring their problems or issues to be problem-solved by the group. In this second context, graduate students became a discourse community developed their own ways of solving problems, working sometimes as more knowledgeable others and sometimes as the one seeking assistance, and generally encouraged each other. The instructor, after providing instruction and modeling during the first course, had little role during the second course besides providing resources, monitoring, and providing occasional corrections.