The modern view on psychological essence of giftedness is presented and new approach to it is offered (using managerial and engineering abilities as an example). It is shown that exposure not only of vocationally important qualities but of their correlation (e. i. the exposure of the whole system of them) is necessary in vocational abilities diagnostics. Certain personality trait's influence on vocational success is connected not to its intensity but to its place in abilities' structure and to the character and the quantity of interrelations with other traits. Comparative correlation analysis of contrasting by effectiveness criterion samples is used as a research method.