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Don't turn the discussion into a lecture.

If case discussions do not replace lectures, neither should they become lectures. A good rule of thumb in leading a discussion is "question-comment-question." Ask the student a short question to clarify his or her remark: "What do you mean when you say the student has no choice but to follow his supervisor's order and dump the contents of the drum out behind the plant?" Then make a comment: "It might be hard to resist the supervisor's order if you just started working at the plant and wanted to make a good impression on your employers." Then ask another question: "What would happen if the student told his supervisor that his order was illegal?"