I created this sheet for my 3rd grade reading group. They were struggling to stay on task and on topic during book discussions. It gives students explicit steps for a purposeful discussion. The steps including reminders for students while they are reading, while they are responding to reading, while others are talking, and when it is their turn to talk. I have included it as a word document, so you can edit it to meet your students specific needs.
I hope this helps you give your students some structure during group discussions!