The High School Characteristic Index (H.S.C.I.) was employed at a high school in Rochester to measure students' perceptions, as well as teachers' ability to predict students' perceptions, after black-white violence occurred in May, 1970. The 1970 results were compared with 1966 results of the H.S.C.I. at the same high school when a different student body (black-white ratio) existed. Comparison of results indicated that there was a dramatic change in students' perceptions between 1966 and 1970 in both expected as well as unexpected directions, and teachers were able to predict with fair accuracy the students' perception of their environment. Some of the major conclusions of this study were that apathy is inversely related to violence and frustration level and violence increase when black-white ratio is increased to a point where blacks are still a minority but have been exposed to middle-class values and advantages. (Author)