Third in a series of Project REACH (Regular Education for All Children with Handicaps) documents is a manual intended for parents of severely disabled students. The manual is centered on ways parents can work together to mobilize community support groups. Formation of a parent support group, the role of the parent facilitator, and ways to acquire and interpret needs assessment data are examined. The parent support group's function in information sharing and support and in advocacy-action is analyzed, as is the group's role as trainers for the community. Approaches to increase participation of community agencies are described, with emphasis on newsletter publication and community participation in parent group meetings. A brief discussion of formative and summative evaluation is followed by appended materials, including a list of resources for topical presentations and parent support. (CL)