Update on the Group-grade Fishbowl Technique

I'm loving this new technique! It has the kids who usually have no trouble in discussion working harder, and, more importantly, the kids who never talk are talking!  I will have to re-design the rubric a bit, and when I do, I'll post it here.  I divide each into 2 teams, and each team spends about 16 minutes in the fishbowl, after which the other team has 10 minutes to question them before that second team gets into the fishbowl.  I know it all sounds complicated but it's really working.