The University of Ottawa (UofO) in Ottawa, Canada offers a formal supplemental instruction program, called the residence study group program (RSGP), to residence students registered in first year courses that are associated with a high degree of failure or attrition. The objective of this study was to assess the impact of this program by comparing a sample of first year residence students who participated in the RSGP with a sample who did not participate. The study compared final grades of students in these courses after controlling for personal motivation and found that while those who participated in the RSGP did not receive higher final grades than non-participants, they were more likely to persist in their studies. It appears that the RSGP contributes in many important ways to the academic and social integration of first year students and these are critical to persistence beyond the first year. (Contains 4 tables.)