Our previous school district used the ITBS (Iowa) in 3rd grade. Before the students take the actual achievement test, they take a group administered IQ test, which produces a Cognitive Skills Index. When a student then takes the ITBS, the score is compared to the anticipated score based on the Cognitive Skills Index. In our school 127 on the CSI was considered gifted and 139+ pretty much ceiling, although 141 is the maximum score.
A group administered IQ test is really a way to screen kids for GT or for further testing. This was really what started us on the road of testing and accommodation. But I would argue that there are huge variances btw. kids who score a 139+ on the CSI because it is a quick written group IQ test.
Jen
