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Comprehensive Test of Nonverbal Intelligence, Second Edition

Donald D. Hammill, EdD, Nils A. Pearson, PhD, and J. Lee Wiederholt, PhD

Assesses intellectual ability
Paper and pencil
Age range:
6 years to 89 years
1 hour
Qualification level:
A degree from an accredited 4-year college or university in psychology, counseling, speech-language pathology, or a closely related field plus satisfactory completion of coursework in test interpretation, psychometrics and measurement theory, educational statistics, or a closely related area; or license or certification from an agency that requires appropriate training and experience in the ethical and competent use of psychological tests. Close

The CTONI 2 uses nonverbal formats to measure general intelligence of children and adults whose performance on traditional tests might be adversely affected by subtle or overt impairments involving language or motor abilities.

Features and benefits

  • Both familiar and unfamiliar stimuli are used.
  • Oral instructions for common non-English languages in the United States are provided.

Test structure

  • Six subtests (Pictorial Analogies, Geometric Analogies, Pictorial Categories, Geometric Categories, Pictorial Sequences, and Geometric Sequences) measure analogical reasoning, categorical classification, and sequential reasoning.
  • Two different types of stimuli are used: pictures of familiar objects (e.g., people, toys, animals) and geometric designs (i.e., unfamiliar sketches and drawings).

Technical information

  • Results are reported as standard scores, percentile ranks, and age equivalents.
  • Normative data, collected in 2007 and 2008, were based on a large representative national sample (N = 2,827) that was stratified by age.
  • Reliability coefficients of the composite are mostly in the .90s, with a few in the high .80s. The CTONI 2 correlates with most well-known intelligence tests in the high .70s.