I just monitor the class, and when it looks like they're starting to get off-topic or they're getting stuck on a problem or whatever, then I can change the exercise. I can stand up and say, "Can I have your attention please? Let's think about doing this, or let's move on to the next step" or whatever. I can sit down and actually be a little more directive and help one team or another, but my style is to sit back and do as little of that as possible and really just listen. That's very valuable, and in a regular lecture mode we don't get a chance to listen. Being able to watch my students, and listen to them, and to hear them talk about concepts-really get a feel for where their level of understanding is and what types of problems they're grappling with-it helps me in that semester, and it really helps me in future semesters. It's a valuable feedback mechanism.

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