The third edition of this guide for teaching chemistry at all levels to students with disabilities covers classroom adaptations, testing and evaluation, computers in the classroom and laboratory, laboratory design, and laboratory safety. The needs of the growing population of students with learning disabilities are addressed, along with the needs of students with hearing, visual, and mobility impairments in the classroom, in using computers, and in the laboratory. A resource section provides sources of information on the Americans with Disabilities Act, descriptions of organizations involved in the education of students with disabilities, a list of guides to colleges and universities that have services for students with disabilities, information on national organizations and hotlines listed by type of disability, and information on selected teaching and laboratory aids and computer materials for persons with disabilities. Contains 77 references. (SW)