Naglieri General Ability Tests

The National Association for Gifted Children (NAGC) emphasizes that gifted identification should not be based on a single test score. Instead, best practice includes multiple objective and subjective measures collected over time, such as ability testing, achievement data, observations, and educator input.

That said, many states and school districts do require standardized assessments, often ability tests, as part of their gifted identification policies. Ability tests such as the Naglieri General Ability Tests are frequently used because they provide objective, norm-referenced data that help clarify a student’s reasoning ability, particularly when classroom performance or achievement data are inconsistent. It is also worth noting that the Naglieri General Ability Tests do not function as a single measure; rather, they include three distinct assessments of ability (Quantitative, Verbal, and Nonverbal), which can be considered multiple measures within a comprehensive evaluation.

Ability tests measure how well a student thinks, while achievement tests measure what a student has already learned.

According to NAGC guidance, ability tests assess general ability, problem solving, and learning potential, whereas achievement tests measure mastery of academic content that has been taught in school.

The Naglieri General Ability Tests are ability tests. They were explicitly designed to measure thinking, rather than acquired knowledge, using verbal, nonverbal, and quantitative content and formats for the tasks. These tasks reduce reliance on language, prior instruction, and cultural familiarity.

Because of this design, scores from the Naglieri General Ability Tests are often used alongside achievement data to help identify students who demonstrate high cognitive potential but may not yet be high academic achievers , alongside those who have high ability and high achievement.

There is no single “best” gifted test. The most appropriate assessment depends on data required as part of the identification process.

The NAGC recommends that gifted identification rely on psychometrically sound standardized assessments aligned to a program’s definition of giftedness. Effective identification systems typically include a combination of ability tests, achievement tests, observations, and performance-based measures. Review the NAGC’s policy document on the role of assessments in gifted and talented identification here.

The Naglieri General Ability Tests were developed specifically to address long-standing concerns about fairness and access in gifted identification. Research cited by the test authors shows minimal performance differences across gender, race/ethnicity, and parental education levels, supporting the Naglieri General Ability Tests’ use as an inclusive ability-based assessment.

Underrepresentation occurs when gifted identification practices rely heavily on measures influenced by language, prior opportunity, or socioeconomic factors.

Students from culturally and linguistically diverse backgrounds, English Language Learners, students from low-income households, and students with disabilities remain consistently underrepresented in gifted programs across North America. Traditional achievement and intelligence tests may inadvertently disadvantage these students when test content depends on vocabulary, formal schooling, or cultural knowledge.

The Naglieri General Ability Tests were intentionally designed to be inclusive and appropriate across diverse groups by using:

• language-reduced directions,
• nonverbal response formats, and
• reasoning tasks that minimize prior academic knowledge.

This design allows students to demonstrate general ability regardless of their background, which is why the Naglieri General Ability Tests are often used in fairness-focused identification efforts, referrals, and universal screening models.

Gifted identification should occur over time, with multiple opportunities for students to demonstrate their abilities.

The NAGC explicitly states that giftedness is dynamic, not static, and that identification should not be based on a single test or a single testing window. Many districts use periodic universal screening at key grade levels, while also allowing referrals at any time.

Ability test results, including those from the Naglieri General Ability Tests, are often considered valid for multiple years, especially when used alongside more frequently collected classroom and achievement test data. Policies regarding retesting frequency are typically determined at the district or state level, not by test publishers.

Gifted identification criteria are determined locally by school districts and typically reflect a combination of percentile-based thresholds, multiple data sources, and professional judgment. Ability test scores, based on local and national norms, are often considered alongside achievement data, classroom observations, and other indicators of academic performance.

Identification rates are highly sensitive to the cut-off scores, and decision rules districts adopt. More stringent criteria, such as higher percentile thresholds or requirements that students meet benchmarks across multiple measures, generally result in smaller identified cohorts, while more flexible cut-offs tend to yield larger cohorts. These decisions should be made in the context of a district’s capacity to provide services, as identification thresholds function as policy levers that directly influence both who is identified as gifted and how many students must be served.