In all 245 British adults provided self- and parental estimates on a normal IQ distribution scale of the 20 second-order abilities identified by Cattell [Cattell, R. (1971). "Abilities: Their structure, growth and action." New York: Houghton Mifflin] as well as their and their parents' overall (g) IQ. After controlling for age, education, and test experience, there were a number of sex differences but only for self-estimates. Males rated their own score higher than females on 11 of the 20 abilities, the biggest differences being on mechanical ability, spatial ability, numerical ability, and originality. When the 20 estimates were regressed onto the overall estimate, the resulted showed 7 estimates predicted overall score and accounted for 77% of the variance. Exploratory and confirmatory orthogonally and obliquely rotated factor analysis was performed on the 20 self-ratings. This revealed four interpretable factors labelled cognitive, verbal, analytic, and aesthetic. Results suggest that participants are lumpers rather than splitters. There was also little evidence of attributional errors. Results are in accordance with the literature on self-rated abilities.