This final report describes activities and accomplishments of the Building Friendships project, which developed, implemented, evaluated, and disseminated an intervention to improve the social integration of students with traumatic brain injury (TBI). The project used an ongoing, informal team approach to bring together and mobilize key people in a student's life around the goal of enhancing the student's school- and community-based social network. The project implemented intervention strategies that are both student-centered and environment-centered. These strategies included direct training of students to enhance social skills, training parents in ways to encourage skill generalization, inservice and peer training about TBI, "peer liaisons," facilitation of involvement in school organizations, training staff of community programs, and pairing community volunteers with TBI students. Students, teachers, and family members reported increases in the number of social contacts and overall time spent with nondisabled peers and the average number of reported friends. Individual sections of the report describe the project's context, goals and objectives, conceptual framework, research participants, intervention strategies, logistical problems and modifications, findings, and impact. Extensive appendices include four articles and book chapters resulting from the project, the manual for a video program, and sample newsletter articles. (DB)