Rotter's social learning theory and signal detection theory are discussed separately and then compared. Adams applied these theories and the concept of expectation to aggression. Adams conducted, two studies in this area with the aid of a questionnaire which he devised. His results indicated that sensitivity to justified vs. unjustified aggression as indexed by d' is related to problem behavior or aggressive behavior as shown by institutionalization or by rating measures. In the present study with 70 eighth grade students, it was found that on two of the three scales least aggressive students were more sensitive to justified vs. unjustified aggression.