usefulness noun

ADJ. limited, some | general | practical | potential

VERB + USEFULNESS have | increase | diminish, limit, reduce Badly written questions limit the usefulness of questionnaires. | assess, evaluate, question | demonstrate, prove | exhaust, outlive The advisory group has outlived its usefulness.

PREP. of … ~ The theory is of limited usefulness. | ~ for the exam's usefulness for ranking students | ~ in the drug's usefulness in the treatment of cancer | ~ to The report is of potential usefulness to the government.