This can be used with any collaborative activity. We use Super Star Math each week. It's a great program for developing critical-thinking in math.
1) develop the habit of being prepared for their small group meeting with pens only and their Super Star paper,
2) be actively involved and focused only on this task, and
3) begin their contribution with their strategies, not their answers to the problems. I remind them that to start with the answer shuts down the conversation.
Please let me know in the comments what you use to help develop good mathematical conversations in your classroom.
We're all in this together!
Pat