Whether allowing for student choice or assigning partners, mixing up partners or groups for assignments can be crucial to assignment completion. Several options for group formation are presented in this board.
Now, what I love about this method of exit tickets is the self-evaluating the students have to do in placing their sticky note on the stop light. They have to decide how they feel about their level of understanding. And guess what? The students are almost always accurate!! They pretty much "hit the nail on the head" when they take this type of ownership in their learning.