As the others have all pointed out... it depends on the child, and I strongly encourage the use of the Iowa acceleration scale manual. DD was grade skipped and is still at the very top of her class. Some worry that by skipping, they will lose being at the top. That's possible, but there are bigger worries if a child is never challenged, doesn't learn how to study because he or she has never had to, and then when faced with a challenge won't know how to handle it.