- Being in a group and being required to make a mistake helped students overcome the fear of presenting their work. No one balked when called to present!
- More students paid attention, with less prodding from me, asking questions and taking notes on correct answers, than have done so when I'm "going over" a quiz.
- The mistakes were varied: from flipping velocity from positive to negative to switching graph labels to bending lines that were supposed to be straight. And their classmates caught almost all of them!
- Some of the students were in the wrong group without noticing it. I think making the quiz number a little bigger will help with this.