I don't get it. How is IQ not malleable? To me, it obviously is. Let's look at the WAIS. One of the subtests measures the size of one's vocabulary. Let's say, you have a child who never used to read. She considered it boring. She was still smart though. Suppose she was good at logical reasoning. Hence, you she got through school and ended up doing well on tests and what not. Suppose she took the WISC as a kid and bombed the vocab section.
Suppose, as an adult she takes on a reading intensive major and starts reading a lot more. If you made her take the WAIS now, she'd score higher on the vocab subtest. Let's say her other scores stay constant. Hasn't her IQ increased? If this isn't convincing just imagine that she also reads up on current affairs a lot more as an adult. So, her information subtest score also increases. Again, hasn't her IQ increased?
Maybe potential is fixed but IQ isn't potential. IQ is something that imperfectly correlates to potential.
