Some experts accept the concept of a single dominant factor of intelligence, general mental ability or g, while others argue that intelligence consists of a set of relatively independent abilities (American Psychological Association task force report, Gottfredson 1998). A single factor is not guaranteed. Other psychological tests which do not measure cognitive ability, such as personality tests, generate multiple factors. Proponents of multiple-intelligence theories often claim that g is, at best, a measure of academic ability.