Knowles and Thomson state that job evaluation is useful in eliminating many of the evils to which nearly all systems of wage and salary payments are subject. These are:
(i) Payment of high wages and salaries of persons who hold jobs and positions not requiring great skill, effort and responsibilities;
(ii) Paying beginners less than they are entitled to receive in terms of what is required of them;
(iii) Giving a raise to persons whose performance does not justify the raise;
(iv)Deciding rates of pay on the basis of seniority rather than ability;
(v) Payment of widely varied wages and salary for the same or closely related jobs and positions; and
(vi) Payment of unequal wages and salaries on the basis of race, sex, religion or political differences.
It may, however, be noted that a job evaluation system does not accomplish all the purpose; rather it facilitates them. Basically, it provides a systematic catalogue of the jobs in an organisation, which is indispensable for management purposes.