ABSTRACT
The same psychometric evidence that has provided support for the idea that a g factor exists has also provided support for at least several and possibly many more specific aptitudes (cf. Guilford, 1967; Spearman, 1923). Let’s start off with the assumption that there are, in fact, many different specific aptitudes but that some will be more significant than others either because of their greater usefulness in a variety of tasks and/or because human culture values certain abilities above others.
