The last two quarters, I've been experimenting with in-class writing a fair bit — the sort of writing students
don't turn in. For the most part, my approach has been simple: I've put a question on the board or on PowerPoint, usually a question designed to evoke a reaction to an assigned reading. I give the students 3-6 minutes to write a response in their notes (though if after the alloted time, I observe that students are still writing, I tend not to interrupt.) Sometimes I've kicked off the class meeting with this, but sometimes I've done it in the middle of a class session to add variety.
On the whole, I'm pleased with this strategy and wonder why I've not often observed in-class writing used in college or university classrooms. My guess is that it seems too baby-ish, a bit like high school math class with students sitting quietly solving equations. But I see a lot of advantages to in-class writing, and I'd be interested to know how others use in-class writing and why.