I think it depends a bit on the child. DS is pretty compliant and followed instructions well at age 6 - much like an older child. I know that older testing is preferred by some, but we had our DS take the WISC at age 6. Then, at age 8, the school insisted on retesting him for the G&T program. The difference between scores? One point.

My opinion? The second test was completely unnecessary.

Also, the earlier testing gave us an earlier understanding of his needs. I am so glad that we did it.