This research was conducted at a Canadian suicide prevention center. The object of the study was to find useful information concerning high school students in the perspective of developing a suicide prevention program in the schools. All 23 local high schools contributed to this study on suicidal ideation and behavior. Subjects (N=2,546) responded to questionnaires on suicidal ideation, adolescent-parent relationships, and a possible chaotic family life. The student sample was divided into three groups. The suicidal group included those students who had tried to commit suicide as well as those who had seriously planned their suicide. The borderline cases included students who had undertaken serious planning but had not thought about suicide at least three times in their lifetimes. The non-suicidal group consisted of students who had never thought of suicide. The results indicated that 7.2% of the students between ages 14 to 19 had already tried to commit suicide and 12.3% had seriously thought about it. It was statistically significant that as the parental attitude toward the child deteriorates, the proportion of suicidal adolescents increased. The proportion of suicidal adolescent behavior was more significant in those families in which the two parents were not living together. The proportion of suicidal adolescents was more significant in households in which parental harmony was considered bad. (ABL)