📌 Key takeaways
- CHC combines Cattell and Horn’s fluid/crystallized model with Carroll’s three-stratum theory into a single hierarchy: a general factor over broad abilities over narrow abilities.
- They include fluid reasoning, comprehension-knowledge, working memory, processing speed, visual and auditory processing, and more — each a cluster of related skills.
- CHC is empirically grounded in decades of factor-analytic research, and it gives test designers a clear map of what to measure.
- Tests like the Woodcock-Johnson and modern Wechsler scales are organised around CHC broad abilities, producing detailed cognitive profiles.
What is CHC theory?
CHC combines Cattell and Horn’s fluid/crystallized model with Carroll’s three-stratum theory into a single hierarchy: a general factor over broad abilities over narrow abilities.
What are broad abilities?
They include fluid reasoning, comprehension-knowledge, working memory, processing speed, visual and auditory processing, and more — each a cluster of related skills.
Why is it dominant?
CHC is empirically grounded in decades of factor-analytic research, and it gives test designers a clear map of what to measure. Most modern IQ batteries follow it.
How is it used?
Tests like the Woodcock-Johnson and modern Wechsler scales are organised around CHC broad abilities, producing detailed cognitive profiles.
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📅 Last updated: 2026-06-18 · ✔ Reviewed by the All-Lifes editorial team · About · Methodology