The thread is interesting to me since I have a DD8. She's never been skipped. Started in K with principal flat-out refusing (we always heard about the child two-years ahead whose parents requested a skip for their son and how they fought them on it...as if it had anything to do with us...I had never heard of the Iowa Acceleration Scale) then going into the new school I thought one skip would be a nice fit but again, not their policy.
I have noticed lately that in her mixed-age music program outside of school, she keeps an eye on the older girls and stands a little straighter and is showing a "smoother" side of herself when she's in that environment. It is a very supervised and focused group and I think because the director and the other kids seem to appreciate her contributions and are supporting her working into the group, it is helping her self-esteem. So I think if a parent can find a group that is matched to the child's strengths and it's a good, supervised environment with an instructor/adult leader who is supportive of the younger child being there and can work in their contributions, it could be wonderful for the child. Especially if the school hyper-focuses on the "challenges".