Assess Crystallized Intelligence with the JCCES

What is the JCCES Test?

The Jouve-Cerebrals Crystallized Educational Scale (JCCES) is a cognitive assessment focusing on crystallized intelligence, measuring accumulated knowledge and reasoning skills. Covering verbal, mathematical, and general knowledge areas, the JCCES provides insights into cognitive development shaped by education and experience.

What Does the JCCES Test Measure?

The test evaluates:

  • Verbal Analogies: Vocabulary and language-based reasoning.
  • Mathematical Reasoning: Problem-solving with quantitative concepts.
  • General Knowledge: Awareness across various subjects.

Psychometric Properties

Supported by robust psychometric data, the JCCES demonstrates high reliability and validity:

Reliability

  • Internal Consistency: Cronbach’s Alpha = 0.96 overall (N = 1,441), with subtest alphas ranging from 0.87 to 0.94, indicating strong reliability across different sections of the test.
  • IRT Analysis: The 2-Parameter Logistic Model IRT shows that JCCES items effectively differentiate across various ability levels.

Validity

  • Construct Validity: Confirmed through factor analysis and Multidimensional Scaling, which showed alignment with core cognitive abilities like verbal reasoning and crystallized intelligence.
  • Concurrent Validity: High correlations (r > .80) with established intelligence assessments such as the WAIS FSIQ and standardized tests like the SAT or the ASVAB AFQT percentile highlight its accuracy in assessing intended constructs.
  • Score Comparisons: JCCES index scores align closely with other assessments of the same kind, ensuring accuracy across diverse populations.

Further Reading

Access JCCES Test