Seventh grade teacher: “My students have been working together in groups for a while now. They're getting along fine. But I'm finding that a lot of them still don't understand the work. I tell them to ‘work together’ and that it is all right to help each other. Sometimes I worry that they are only giving each other the answers. How can I get them to focus on problem solving and not just putring down the right answer?”
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Farivar et al. (1994) studied this question.