This study investigated the effects of a Direct Instruction (DI) reading comprehension program on the reading comprehension skills of adolescents with autism spectrum disorder or intellectual disability. Although the effectiveness of DI programs has been well documented in disability and instructional literature, effectiveness of DI for individuals with autism and intellectual disability is sparse. This study examined the effects of "Corrective Reading Comprehension: B1," a reading comprehension program, on students' acquisition of specific reading comprehension skills (parts of speech, combining sentences with and, identifying contradictions, and identifying relevant/irrelevant information). A single subject multiple-probe across behaviors design was employed to investigate whether a functional relation existed between DI and reading comprehension for this sample. A functional relation between the DI and reading comprehension was demonstrated for each participant across all behavioral conditions. Additional data were collected in the area of reading comprehension using standardized and curriculum-based measures. Implications for practice and future research are discussed. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]