We studied the effects of participating in regular education classes on the social life of three high school students with severe disabilities. Using a multiple baseline design across students (with an embedded ABAB withdrawal design), participants' social contacts and social networks were analyzed. Data were collected throughout the school day across 1 school year. Regular class participation, the independent variable, was introduced within a baseline focusing upon a community-based curriculum including access to peers without disabilities via peer tutoring and ''friendship'' programs. Our results indicate that regular class participation: (a) increased the frequency of social contacts students had with peers without disabilities, (b) was the locus for meeting half of the peers without disabilities contacted across the school year, and (c) was an important source for meeting peers without disabilities who subsequently became members of students' social networks. In addition, our results showed that: (a) durable and frequent social contacts also occurred with peers without disabilities met outside of regular education classes, (b) the amount of contact with peers extending outside of regular classes varied across students, and (c) the perceived quality of social contacts did not vary systematically with the locus of initial contact. The results are discussed in relation to possible outcomes relating to regular class participation at the secondary level and areas for future research.