Concerning the group testing, I believe the thoughts about accuracy tend to focus on underperforming, rather than overperforming. A child who tops out on these tests, may also score much, much higher on an individually administered test, which is a good kind of not as acccurate.
The first IQ test we embarked on was paid out of pocket, $500 and at the time we considered it quite a financial strain.
In hindsight, it was money well spent.
The Davidson Institute is tremendous, IMO, in supporting the needs of profoundly gifted children. If a child looks like they are in that category, I'd recommend further testing.
Regardless of level of giftedness, the information from individual IQ and achievement testing can be so valuable in terms of supporting their educational and learning needs.
If tests show a child that is three or more standard deviations above the mean in terms of score, I'd definitely pursue the support of The Davidson Institute.
HTH
Neato
