Unfortunatly, what passes for 'research' against ability grouping is highly political. I'm wondering if the 'issue' that a high ability grouped kid would face in 5/6th grade is that they run out of curriculum.

I asked my brother about subject acceleration that he got in Math in elementary school:
In first grade I went to 2nd.
In 2nd grade I went to 3rd.
In 3rd grade I went to 4th.
In 4th grade I went to 5th.
In 5th grade there was no place to go, so I did 5th again.

((shudder))
Grinity

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