http://www.theguardian.com/education/2011/jan/25/cambridge-may-end-individual-tuition
but from what I saw sitting in on a couple of tutorials at Oxford a few years ago, two or three learners at a time being supervised by an expert was a remarkably efficient model with regards to learning. It implicitly forms a study group and it is in essence a regular exhibition of learning to peers. It is simply a format in itself more fertile for learning.
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