This is the third in a series of four reports from Toronto's 1975 Every Student Survey. This report describes the relationships between students' social and demographic background and program placement in the elementary and secondary school in the Toronto school system. Its purpose is to examine the relationships between program placement and both ethnic background and parental occupational status. The survey upon which the report is based established that almost 50% of the 1975 school population in Toronto came from low socio-economic backgrounds; 46% had English as a second language, and almost 60 nations were claimed as "country of birth" by at least 25 students per nation. Approximately 7.5% of the elementary school population was served by special education programs, and approximately 60% of the secondary school population was enrolled in the fifth level of secondary school. Students' background characteristics were consistently related to program placement. The socioeconomic background of students in the Toronto school was generally a far better predictor of both special class placement and level of study in the secondary school than either country of birth or mother tongue. (Author/CLK)