There are many who would deny that test results are consistent across cultural and ethnic lines. For example http://www.rastafarispeaks.com/community/modules.php?name=News&file=article&sid=83
gives an overview of the history and controversy regarding intelligence testing. I resist the notion that true intelligence is measured with a Eurocentric literary yardstick. Not to be patronizing, but if I said to you, "Yo let's bounce to the LQ for a little sumthin-sumthin and get crumped." You might have trouble with comprehension. Yes, it is one small part of urban life, but it is also an illustration of how easy it is to marginalize a vast portion of our human resources in this country.