This product is design for my class size of 21 but it can be modified for any class size. Cut and tape down on the desk of each shape for a student. The grouping can be done in three different ways: color, shape, or number. No group is identical and works great for predetermined groups. My shapes are grouped by high, medium, and low academic students. My colors are equal ability grouping. Lastly, you can used numbers for a behaviors and groups that balance well. You simply just have them get int