Search keywords included Cattell-Horn-Carroll,
CHC theory, CHC, Gf-Gc theory, Gf- Gc, Woodcock- Johnson-Revised,
WJ-R, Woodcock-Johnson III, WJ III, Kaufman Assessment Battery for
Children—Second Edition, KABC-II, Differential Abilities
Scales, DAS, Differential Abilities Scales—Second Edition
(DAS-II), Stanford- Binet—Fifth Edition, and SB-IV. Years
included in the searches spanned 1988 to 2009.
Third, a request was posted to the Cattell-Horn-Carroll
(CHC) and the National
Association of School Psychologists (NASP) general
purpose listservs asking members for copies of published and
unpublished manuscripts or references related to the review.
Finally, an ancestral search involved examination of the
references of the initial research reports (acquired during the
first three steps) to determine if they contained references to
studies not revealed by the primary search strategy that should be
secured for review (Cooper, 1998).