This article examines the qualitative and quantitative differences between course-based service learning programs and non-course-based service programs at the post-secondary level. A review of the research to date reveals greater benefits for students who participate in course-based community service compared to participation in non-course-based service. The course-based model's cognitive component of organized reflection appears to be the key contributing factor that produces benefits superior to the non course-based approach, both in number and quality. Based on these findings, post-secondary institutions using non-course-based service learning program should consider changing to the course-based model.