Reading opens many doors and students who do not comprehend well face serious barriers as they enter postsecondary academic institutions. Young people should be able to read and write when they graduate from high school. Such skills allow people to continue their education as well as increase their odds that they can earn an adequate salary. The percentage of 12th graders reading below grade level has remained remarkably stable over the years. A large number of students entering colleges and universities are unable to derive meaning from print at age-expected levels. The purpose of this study was to examine the treatment fidelity and social validity of a systematic and explicitly structured peer-mediated reading comprehension intervention on the reading performance of underprepared postsecondary students. Seven peer mentors and sixteen first-time college students participated in the study. Results indicated the peer-implemented reading program was implemented with high levels of treatment fidelity and social validity while also yielding statistically significant comprehension gains. (Contains 2 tables and 5 figures.)