The Naglieri Nonverbal Ability Test (NNAT) is a nonverbal measure of general ability. There are three versions of this test. First is the Naglieri Nonverbal Ability Test - Individual Form published in 2004. Two versions were published in 2007 and 2008, respectively. This includes the group administered Naglieri Nonverbal Ability Test - Second Edition and the Naglieri Nonverbal Ability Test - Online version. Like all nonverbal ability tests, the NNAT is intended to assess cognitive ability independently of linguistic and cultural background.
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These tests are administered to Kâ12 school children on an individual or group basis as a means to identify potentially gifted children for placement in accelerated programs.
The NNAT has been found by at least one study to show excessive score variability, with within-grade standard deviations reaching as high as 20 points. This has the effect of both overrepresenting and underrepresenting index scores - that is, more students received very high or very low scores than expected. Lohman et al. found that 3.4 times as many students scored in the 130+ range on the NNAT as expected.[1]