However, it has been known for over 200 years that potential giftedness is equally distributed  among all races and cultures. So how do we account for this clearly unequal distribution in our public schools?

Dr. Ford goes on to say “Giftedness has been defined and identified by performance on intelligence tests whose unquestionable analogy is ‘the higher the IQ score, the higher the intelligence’. However, Gallagher and Weiss (1985) argued that each culture defines giftedness in its own image, and Sternberg (2007) noted that giftedness in one culture may be different for another culture”

http://www.examiner.com/gifted-education-in-houston/reversing-underachievement-among-gifted-black-students-2nd-edition-review