The relationship between the Scholastic Aptitude Test of Ontario (S.A.T.O.) administered to twelfth grade students and the College Entrance Examination Board Scholastic Aptitude Test (C.E.E.B.), of which the S.A.T.O. is a modification, was studied. Data was collected through the co-operation of the schools. The S.A.T.O. data was recorded as raw scores; the C.E.E.B. data was recorded in standard scores. Computer analyses on all data were performed. It was found that the relationships between these two tests were very similar for those who were in the Arts and Science program and for those who were in the Technical or Commercial programs. Further study is recommended. (CK)