In the 1990s , Carroll 's model was combined with Cattell - Horn 's work by Flanagan , McGrew , and Ortiz ( 2000 ) .
Cattell - Horn 's model was similar on several fronts , including its hierarchical structure .
In the 1990s , Cattell - Horn 's model was combined with Cattell - Horn 's work by Flanagan , McGrew , and Ortiz ( 2000 ) .
Cattell - Horn 's model was similar on several fronts , including its hierarchical structure .