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
number of extensions to the CHC taxonomy. Following Stankovs (2000) research distinction,
structural extensions reported here are classified as either internal (i.e., elaboration on the
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).