The Naglieri Non-Verbal Ability Test, or NNAT, was created by Jack A. Naglieri, Ph.D. in 2003. The test is used to measure a student's general reasoning ability. The test is short - about 30 minutes - and uses geometric shapes and designs to assess students. The test is often used to admit students for gifted education programs, and is often used to evaluate students who speak a different language than their teachers, deaf students and those with color blindness. To learn more about the NNAT, read our NNAT Test Guide and our test expert Interview with Tim Sitar.