Two children can earn similar grades while approaching unfamiliar problems very differently. Reasoning assessments try to add information that an ordinary spelling quiz or math worksheet may not show.
CogAT, NNAT3, and OLSAT are used by educational teams to examine aspects of reasoning or ability. They may contribute to decisions about advanced learning, but they are not interchangeable with achievement tests or with a comprehensive individual evaluation.
CogAT: verbal, quantitative, and nonverbal reasoning
The Cognitive Abilities Test (CogAT) includes verbal, quantitative, and nonverbal batteries. Those areas use different kinds of symbols and relationships. Ask whether the child took the full assessment, a screener, or a modified combination of subtests; a brief screening result does not provide the same profile as a complete administration.
Look at the pattern across the available batteries, not only a composite. A strong quantitative result may be useful when planning mathematics even if another area is more typical. Interpretation should connect the report to the learner and the purpose of the assessment.
NNAT3: reasoning with visual patterns
The Naglieri Nonverbal Ability Test, Third Edition (NNAT3) uses abstract designs and pictorial directions with minimal language demands. This can be useful when a language-heavy task would create a barrier. The publisher describes it as a nonverbal measure of general ability for kindergarten through grade 12.
“Nonverbal” does not mean that the result exists outside every influence of experience, access, attention, or testing conditions. Ask what this particular task helped the team see and what other evidence is needed.
OLSAT: school-related cognitive abilities
The Otis-Lennon School Ability Test, Eighth Edition (OLSAT 8) includes verbal, nonverbal, and quantitative content. Tasks involve relationships, classification, sequences, analogies, and related reasoning demands. Pearson also provides an ability–achievement comparison when OLSAT is administered with Stanford 10.
OLSAT is not another name for the WISC-V. Knowing the exact instrument helps prevent a group school-ability result from being discussed as though it were the same evaluation as an individually administered cognitive battery.
Why might the results disagree?
Assessments sample different tasks, use their own scales and norm groups, and can place different demands on language, memory, speed, or visual reasoning. The child’s circumstances on the day also matter. A difference deserves explanation rather than an immediate conclusion that one score is the child’s “real” ability and the others are wrong.
Ask the professional to explain the score’s uncertainty and whether differences among results are meaningful for the educational decision. Do not compare percentiles from different tests as if they were repeated measurements on one ruler.
A program decision is not a definition of the child
There is no single gifted-program cutoff that applies nationally. Ask which measures the program uses, whether it considers local or national comparisons, how it handles uneven profiles, and what review options exist. A child who does not meet one program’s criteria may still need more challenging instruction.
Before testing, ordinary preparation can mean sleep, a familiar explanation of the day, and approved examples of the response format. Ask the examiner about preparation rather than rehearsing secure items or trying to manufacture a particular score.
Ask for the educational connection
“What did this assessment reveal about how my child learns, and how will that inform the work offered?”
Sources & further reading
Publisher and developer information checked November 2, 2026. Names, editions, and report formats can change.