In our classroom, a lot of the thinking and learning happens in random groups of three at vertical whiteboards.
A. Only one marker per group. Share the marker (every few minutes or problem).
C B. It's okay to erase mistakes, but don't erase someone else's work without permission.
C. Three roles: Write | Talker | Observer
D. The person writing cannot write any of their own ideas.
E. Groups are responsible for the learning of every member of the group.