Like Val and GM5 said, the IQ score/test is just one area to consider. One must also consider the child's strengths and weaknesses in other areas. Many children don't do well in IQ tests. It also depends on the tester and their experience with gifted children, etc. So, just using an IQ score as a determining factor is... limiting of the potential of each child.

Like spiritedmama said, differentiation for every child...