I am a new (and young) instructor, and I have a question about how to keep all of my students involved while in groups. Last week I gave my first in-class group assignment, but it wasn't as successful as I had hoped. I assigned them to groups of 5-6 (there were 5 groups, I have 28 students), and gave them a case study to analyze and questions to answer. I couldn't seem to keep all of the students focused on the assignment. Some of the students were involved in conversations unrelated to the material or simply did not participate in the activity at all.
I made sure to walk around the room the entire time, and had multiple one on one discussions with each group as they worked through the activity. I made sure to involve everyone in the group and asked questions that required them to elaborate on previously given responses. I thought this would help keep them engaged and on track, but when I left the group to go to another, many of them lost their focus.
I would really like to continue group work in the classroom, and do not want to teach a class that is completely lecture-based. Is there something that I can change about my own behavior or in the way I set up the activity that could help to increase the students' motivation for future group activities?