Who Gets into Gifted and Talented Education Programs?
NBER
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In Can Universal Screening Increase the Representation of Low Income and Minority Students in Gifted Education? (NBER Working Paper No. 21519), David Card and Laura Giuliano explore the experience of a school district that they describe as "one of the largest and most diverse" in the nation.

Until 2005, the district selected candidates for its elementary-level gifted and talented program from among first- and second-graders recommended by parents and teachers. This pool was then winnowed based on IQ scores and evaluation for such traits as motivation, creativity, and adaptability. While the district offered free IQ testing, private psychologists did a thriving business administering tests to more affluent students who wanted to skip the queue or try again if their initial scores fell short.

To qualify for gifted status, students generally had to score at least 130 on the IQ test. However, to offset economic and linguistic disadvantages, a lower threshold of 116 applied to students who received subsidized lunches or were designated as English language learners. Despite this effort to level the playing field, enrollment in the gifted program was skewed toward white students from higher-income families. Blacks and Hispanics made up fewer than 30 percent of the students in the program, although they accounted for 60 percent of the district's students overall.