My daughter took the RIAS. I have seen research that it correlates well with the WISC. She scored FSIQ 140. However, on the WISC FSIQ was 123 but GAI was 140. The RIAS does not test processing speed which really lowered my daughters score on the WISC. It is a good short test, however, if you want to apply to any gifted programs outside of your school district you will need further testing with the WISC or SB.