1. IQ just measures just one aspect, a small part of our cultural adaptation to the environment
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2. Language barriers frequently result in misclassifying non or limited standard English speakers as mentally inferior. In special education this is sometimes referred to as the "6 hour retardant" because it is only for the 6 hours that students are in school that they are considered mentally retarded. The rest of the time they are recognized to have normal intelligence.
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3. [Besides inaccurately measuring 'intelligence' intellience tests have been used to justify discrimination] As a result the Immigration Code of 1924 adopted a policy of immigration quotas based on national origins because a report to the Congressional Committee on Immigration and Naturalization said that studies of intelligence showed that Americans could not "afford to ignore the menace of race deteriorization or evident relations of immigrants to nation progress and welfare".
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4. [Different cultures view different skills as important, which may account for differences in perceived intelligence and IQ scores between different races.] The skills valued in intelligence testing, such as speed on these timed tests, may not be valued in some cultures. Many important decisions in everyday life, that truly require application of intelligence, are not made in the few seconds allowed to solve IQ test items. Consequently, we're confounding a person's true intelligence with how we assess it.
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