Gale H. Roid, Ph. D.; Lucy J. Miller, Ph. D.; Mark Pomplun, Ph.D.; Chris Koch, Ph.D.








Measure nonverbal intelligence

Paper version and object of manipulation

Clinical Evaluation of Neuropsychological Intelligence and Capacities

Psychologist Doctor Psychiatrist Educational psychologist

French and English- does not require the use of language except for instructions.

30-90 min

  • Enhanced Data on Difficult-to-Assess Clinical Groups

  • Attention Deficit/Hyperactivity Disorder

  • Autism

  • Cognitive Delay (severe)

  • English as a second language (ESL)

  • Gifted/Talented

  • Hearing Impairment (severe)

  • Learning Disability

  • Motor Delay (severe)

  • Speech/Language Impairment (severe)

What’s New with Leiter-3!

  • Block and Frame format for more accurate assessment of Autistic individuals

  • Decreased number of subtests, increasing overall efficiency and utility of the instrument

  • A neuropsychological subtest (Nonverbal Stroop Test) has been added

  • All new Attention-Divided subtest, with greater reliability, and ease of use new Manipulatives

No Cultural or Language Bias

Psychometric studies show the Leiter-3 to have exceptional fairness for all cultural and ethnic backgrounds. The test is very useful for nonverbal, non-English speaking individuals, as well as those with ADHD, Autism and other Communication Disorders.

Designed with Safety in Mind

The Leiter-3 was redesigned to accommodate individuals with a wide range of cognitive and physical disabilities. Blocks are lightweight, colorful, non-toxic, and choke-safe, with rounded corners, to prevent harm to either the subject or examiner. The Frame is lightweight, yet durable, without sharp corners. Foam Pieces are durable and brightly-colored. Easel and Stimulus Books are laminated for durability and easy clean-up.

Leiter-3 Subtests

Cognitive Scales (Fluid Intelligence)
Unlike other IQ tests, the Leiter-3 emphasizes fluid intelligence, the truest measure of an individual’s innate cognitive abilities. This makes the Leiter-3 more accurate and fair, since IQ is not significantly influenced by the individual’s educational, social and family experience.
Sequential Order (SO)
Form Completion (FC)
Classification and Analogies (CA)
Figure Ground (FG)
Matching/Repeated Patterns (M/RP)- optional

Attention and Memory Scales

Attention and Memory subtests enhance interpretation of the global IQ score, by providing valuable diagnostic indicators regarding the score on the Cognitive portion of the Leiter-3. They also distinguish individuals with ADHD, LD or neuropsychological impairments, from typically-functioning individuals.

  • Forward Memory (FM)

  • Attention Sustained (AS)

  • Reverse Memory (RM)

  • Nonverbal Stroop (NS)

  • Attention Divided (AD)

Examiner Rating Scale

The Social-Emotional Examiner Rating Scale gathers information about the individual’s: 

  • Attention 

  • Organization

  • Skills Impulse

  • Control 

  • Activity Level 

  • Anxiety 

  • Energy and Feelings 

  • Mood Regulation 

  • Sociability 

  • Sensory

  • Reactivity

  • ScoringT


The Leiter-3 provides individual subtest, and numerous composite scores, that measure intelligence and discrete ability areas. 
These scores identify strengths and weaknesses in individual skills, as well as skill sets. Percentile and age-equivalent scores are provided.

Growth Scores are provided for all domains, enabling professionals to measure small, but important, cognitive shifts within a skill set, particularly important for children cognitive disabilities. Tracking these shifts allows professionals, educators and parents to see the improvement (growth) across time, irrespective of age-based standard scores.

Normative Data

Normative data includes more than 1600 individuals, representative of the most current general population, in terms of ethnicity/race, gender and age. The normative sample is also diverse in terms of parent/self education level and geographical region.

The Leiter-3 Kit includes all Manipulatives (Frame, Blocks, Foam Shapes, Stimulus Cards, Attention Divided Bowls), an Easel Book, a Stimulus Book, Scoring Keys, Administration Gestures Laminate, Record Forms, Response Booklets, a Manual, a Timer and a Purple Marker, all in a convenient Rolling Backpack.

To know :

The test is only available in English.
However, since Leiter-3 is a non-verbal test, it is still possible to administer it to a person who does not speak English.

In addition to this, you need to know more about it.