Yes, I do think many GT children could be missed by school districts. Private testing is the way to go in terms of getting an accurate assessment. I do understand why school districts use the Cogat (it's a decent screening tool), but it's not an accurate measure of IQ. I am thankful that our district is very GT friendly, and administers IQ tests (but only if the Cogat is high...so there again, some children could be missed). Both my girls have had private testing done too. We had to do private testing for peace of mind that we were not missing something.