The Cattell–Horn–Carroll theory, or CHC theory, is a psychological theory of human cognitive abilities that takes its name from Raymond Cattell, John L. Horn and John Bissell Carroll. Recent advances in current theory and research on the structure of human cognitive abilities have resulted in a new empirically derived model commonly referred to as the Cattell–Horn–Carroll theory of cognitive abilities. CHC theory of cognitive abilities is an amalgamation of two similar theories about the content and structure of human cognitive abilities. The first of these two theories is Gf-Gc theory (Raymond Cattell, 1941; Horn 1965), and the second is Carroll's (1993) Three-Stratum theory. Carroll's expansion of Gf-Gc theory to CHC theory was developed in the course of a major survey of research over the past 60 or 70 years on the nature, identification, and structure of human cognitive abilities. That research involved the use of the mathematical technique known as factor analysis. In comparison to other well-known theories of intelligence and cognitive abilities, CHC theory is the most comprehensive and empirically supported psychometric theory of the structure of cognitive and academic abilities.
The CHC model was expanded by McGrew (1997), later revised with the help of Flanagan (1998). Later extensions of the model are detailed in McGrew (2011) and Schneider and McGrew (2012) There are a fairly large number of distinct individual differences in cognitive ability, and CHC theory holds that the relationships among them can be derived by classifying them into three different strata: stratum I, "narrow" abilities; stratum II, "broad abilities"; and stratum III, consisting of a single "general ability" (or g).
There is a higher order general factor and 9 broad stratum abilities and over 70 narrow abilities below it:
Broad and narrow abilities
The broad abilities are:
- Comprehension-Knowledge (Gc): includes the breadth and depth of a person's acquired knowledge, the ability to communicate one's knowledge, and the ability to reason using previously learned experiences or procedures.
- Fluid reasoning (Gf): includes the broad ability to reason, form concepts, and solve problems using unfamiliar information or novel procedures.
- Quantitative knowledge (Gq): is the ability to comprehend quantitative concepts and relationships and to manipulate numerical symbols.
- Reading & Writing Ability (Grw): includes basic reading and writing skills.
- Short-Term Memory (Gsm): is the ability to apprehend and hold information in immediate awareness and then use it within a few seconds.
- Long-Term Storage and Retrieval (Glr): is the ability to store information and fluently retrieve it later in the process of thinking.
- Visual Processing (Gv): is the ability to perceive, analyze, synthesize, and think with visual patterns, including the ability to store and recall visual representations.
- Auditory Processing (Ga): is the ability to analyze, synthesize, and discriminate auditory stimuli, including the ability to process and discriminate speech sounds that may be presented under distorted conditions.
- Processing Speed (Gs): is the ability to perform automatic cognitive tasks, particularly when measured under pressure to maintain focused attention.
A tenth ability, Decision/Reaction Time/Speed (Gt), is considered part of the theory, but is not currently assessed by any major intellectual ability test. For this reason, it does not appear in cross-battery reference materials.
- Decision/Reaction Time/Speed (Gt): reflects the immediacy with which an individual can react to stimuli or a task (typically measured in seconds or fractions of seconds; not to be confused with Gs, which typically is measured in intervals of 2–3 minutes).
McGrew proposes a number of extensions to CHC theory, including Domain-specific knowledge (Gkn), Psychomotor ability (Gp), and Psychomotor speed (Gps). In addition, additional sensory processing abilities are proposed, including tactile (Gh), kinesthetic (Gk), and olfactory (Go).
The narrow abilities are:
|Quantitative knowledge||Reading & writing||Comprehension-Knowledge||Fluid reasoning||Short-term memory||Long term storage and retrieval||Visual processing||Auditory processing||Processing speed|
|Mathematical knowledge||Reading decoding||General verbal information||Inductive reasoning||Memory span||Associative memory||Visualization||Phonetic coding||Perceptual speed|
|Mathematical achievement||Reading comprehension||Language development||General sequential reasoning||Working memory capacity||Meaningful memory||Speeded rotation||Speech sound discrimination||Rate of test taking|
|Reading speed||Lexical knowledge||Deductive reasoning||Free-recall memory||Closure speed||Resistance to auditory stimulus distortion||Number facility|
|Spelling ability||Listening ability||Piagetian reasoning||Ideational fluency||Flexibility of closure||Memory for sound patterns||Reading speed/fluency|
|English usage||Communication ability||Quantitative reasoning||Associative fluency||Visual memory||Maintaining and judging rhythms||Writing speed/fluency|
|Writing ability||Grammatical sensitivity||Speed of reasoning||Expressional fluency||Spatial scanning||Musical discrimination and judgement|
|Writing speed||Oral production & fluency||Originality||Serial perceptual integration||Absolute pitch|
|Cloze ability||Foreign language aptitude||Naming facility||Length estimation||Sound localization|
|Word fluency||Perceptual illusions||Temporal tracking|
|Figural fluency||Perceptual alternations|
Many tests of cognitive ability have been classified using the CHC model and are described in The Intelligence Test Desk Reference (ITDR) (McGrew & Flanagan, 1998). CHC theory is particularly relevant to school psychologists for psychoeducational assessment. 5 of the 7 major tests of intelligence have changed to incorporate CHC theory as their foundation for specifying and operationalizing cognitive abilities/processes. Since even all modern intellectual test instruments fail to effectively measure all 10 broad stratum abilities an alternative method of cognitive assessment and interpretation called Cross Battery Assessment (XBA; Flanagan, Ortiz, Alfonso, & Dynda, 2008) was developed.
- Fluid and crystallized intelligence for Gf-Gc theory
- Flanagan, D. P., & Harrison, P. L. (2005). Contemporary intellectual assessment: Theories, tests, and issues. (2nd Edition). New York, NY: The Guilford Press
- McGrew, K. S. (2005). The Cattell-Horn-Carroll theory of cognitive abilities: Past, present, and future. In D. P. Flanagan, J. L. Genshaft, & P. L. Harrison (Eds.), Contemporary intellectual assessment: Theories, tests, and issues (pp.136–182). New York: Guilford.
- McGrew, K. http://www.iapsych.com/CHCPP/CHCPP.HTML Retrieved 12/6/2011.
- Schneider, W. J. , & McGrew, K. S. (2012). The Cattell-Horn-Carroll model of intelligence. In D. Flanagan & P. Harrison (Eds.), Contemporary intellectual assessment: Theories, tests, and issues (3rd ed., pp. 99–144). New York: Guilford.
- Flanagan, D. P., Ortiz, S. O., & Alfonso, V. C. (2007). Essentials of cross-battery assessment. (2nd Edition). New Jersey: John Wiley & Sons, Inc
- Carroll, J.B. (1993). Human cognitive abilities: A survey of factor-analytic studies. Cambridge, England: Cambridge University Press.
- Cattell, R. B. (1941). Some theoretical issues in adult intelligence testing. Psychological Bulletin, 38, 592.
- Cohen, R. J., & Swerdlik, M. E. (2004). Psychological testing and assessment. Chicago, IL: McGraw-Hill (6th ed.)
- Flanagan, D. P., Ortiz, S. O., & Alfonso, V. C. (2013). Essentials of cross-battery assessment (3rd edition). New York: Wiley.
- Flanagan, D. P., Ortiz, S. O., Alfonso, V. C., & Dynda, A. M. (2008). Best practices in cognitive assessment. Best Practices in School Psychology V, Bethesda: NASP Publications.
- Gustafsson, J. E., & Undheim, J. O. (1996). Individual differences in cognitive functions. In D.C. Berliner & R. C. Calfee (Eds.), Handbook of educational psychology (pp. 186–242). New York: Macmillan Library Reference USA.
- Horn, J. L. (1965). Fluid and crystallized intelligence: A factor analytic and developmental study of the structure among primary mental abilities. Unpublished doctoral dissertation, University of Illinois, Champaign.
- McGrew, K. & Flanagan, D. (1998). The Intelligence Test Desk Reference: Gf-Gc cross-battery assessment. Allyn & Bacon.
- Gregory, Robert J. (2011). Psychological Testing: History, Principles, and Applications (Sixth ed.). Boston: Allyn & Bacon. ISBN 978-0-205-78214-7. Lay summary (7 November 2010).
- Kaufman, Alan S. (2009). IQ Testing 101. New York: Springer Publishing. ISBN 978-0-8261-0629-2. Lay summary (10 August 2010).
- Tucker, William H. (2009). The Cattell Controversy: Race, Science, and Ideology. University of Illinois Press. ISBN 978-0-252-03400-8. Lay summary (30 August 2010).