There are several reasons we may wish to keep students apart from each other. Ironically, regardless of the reason, those students often want to be together. And that will happen when you start randomizing your groups—usually on the first day. The best thing to do when this happens is to visit that group first and just say, “Are we going to have a problem here?” More often than not, these students are so thrilled to be together that they do not want to ruin their chances of it happening again. If the situation is one where the students don’t want to be together, then the intervention is
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