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Calibrated Neuropsychological Normative System

David J. Schretlen, PhD, ABPP, S. Marc Testa, PhD, and Godfrey D. Pearlson, MD

Enables you to interpret various test scores
Paper and pencil, E-Manual
Age range:
18 years to 90 years
Administration times vary
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

Use the CNNS in Your Interpretation of Tests


The CNNS is designed to assist clinicians and researchers in their interpretation of the tests included in its normative system. The Professional Manual provides age-based norms.

Features and benefits

  • Raw scores are used to generate scaled scores, T scores, and percentiles for 73 measure and factor scores derived from 24 tests.
  • Six summary or factor scores were constructed (Processing Speed, Attention/Working Memory, Verbal Learning and Memory, Visual Learning and Memory, Ideational Fluency, and Executive Functioning) from various measures within the tests.
  • Twenty-two discrepancy scores are provided, along with significance tests and cumulative frequency analyses for the obtained differences to assess the examinee’s unique and relative strengths and weaknesses.
  • A conormed approach provides you with greater confidence that differences in performance across cognitive domains reflect true cognitive strengths and weaknesses of your client.