I find that in the course of monitoring discussions on a discussion board or forum it often helps to insert a problem or dilemma involving a concept being discussed. The problems or "dilemmas" that I insert usually involve a situation that I have been personally involved in. I give the facts and simply ask members of the group to suggest their own solutions or analysis. I also encourage students to use involvement in such relevant situations as the ideal way to demonstrate how such a problem or dilemma might be solved. This type of technique gives the person providing it extra credibility since he or she has actually "lived through" the situation.