This theme issue provides an overview of how parents and professionals can be involved in advocacy efforts for children with disabilities, ages 3 and older. The guide begins with a definition of advocacy and a discussion of parents' and professionals' roles as advocates. It outlines legal rights, specific parental rights provided by the Individuals with Disabilities Education Act, suggestions to parents in exercising parental rights, performance standards relating to parent involvement with Head Start programs, and a description of the special education system and effective ways to handle the system. Appendices provide the School Assertiveness Inventory, an "ERIC Digest" on rights and responsibilities of parents of children with disabilities, a list of parent training centers, qualities of a good advocate, advocacy strategies, and updates on advocacy activities in six states. Seven references and a bibliography of seven items are provided. (JDD)