"This study attempted to formulate operational definitions for the various meanings of the concept of hostility. Thirty men and thirty women, patients in a neuropsychiatric hospital, were interviewed and rated by three judges for the following aspects of hostility: Resentment, Verbal hostility, Indirect hostility, Assault, Suspicion, Over-all hostility, and Strength of hostile urges. Also, the Iowa Hostility Inventory was administered. It was found that the judges'' ratings of the various aspects of hostility showed general agreement.".