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 1. 1. Introduction 
 2. 2. Evolution of CHC Theory 
 2.1 A. Early psychometric heritage 
 2.2 B. 1st Generation Gf-Gc Assess...  
 2.3 C. CHC (Gf-Gc) Investigations...  
 3. 3. Empirical Evaluations of th...  
 3.1 A. Large sample studies 
 3.2 B. Small sample studies 
 3.3 C. Summary and conclusions 
 4. 4. CHC Theory Extensions 
 4.1 A. Internal CHC structural ext...  
 4.2 B. External CHC structural ext...  
 5. 5. Betwixt, behind and beyond ...  
 5.1 A. g: Betwixt Horn and Carro...  
 5.2 B. Behind g: Working Memory? 
 5.3 C. Beyond g: CHC Lower-Strat...  
 6. 6. Summary & conclusions 
 6.1 A. Conclusions and Caveats 
 6.2 B. Implications and Future Di...  
 6.3 C. References 
 7. Related projects & key tables ...  
 7.1 Carroll Human Cognitive Abilit...  
 7.2 Cattell-Horn (CHC) Definition ...  
 7.3 Tables 
 7.4 Figures 
4. 4. CHC Theory Extensions
4.1 A. Internal CHC structural extensions
4.2 B. External CHC structural extensions
CHC theory currently consists of nine broad abilities (Gf, Gc, Gv, Ga, Gsm, Glr, Gs, Gq, Grw).  A review of the factor analytic research during the past decade (1993-2003) argues for a number of extensions to the CHC taxonomy.   Following Stankov’s (2000) research distinction, structural extensions reported here are classified as either internal (i.e., elaboration on the nature of existing well-estbablished broad CHC factors) or external (i.e., research that suggests new broad ability domains or domains that have been only been partially investigated).
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