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Here, peer tutoring is seen as a form of cognitive interaction with a more experienced peer (Vygotsky 1978), leading the task or discussion .
Barbara Rogoff (1990) also talked about Apprenticeship in thinking. (EXPAND)
There are also discussions about how student can learn by reading the material provided by tutor and teaching it to a peer (as documented by a study (Antis, 1983) provides high order conceptual understanding.