The directory lists mutual support groups concerned with the medical and psychosocial impacts of genetic disorders and birth defects on affected individuals and families. Each organization included is dedicated to the ongoing emotional, practical, and financial needs of these populations. Entries are categorized by disorder, including: general, auditory, cancer, cardiovascular, chromosomal, connective tissue, craniofacial, developmental, gastrointestinal, hematologic, immunologic, kidney, mental, metabolic, muskoskeletal, neurologic, neuromuscular, short stature, skin, and visual disorders. Listings are also indexed by subject and organization name. Information provided in the organization listings includes the names of the executive director and a contact person, the chapters or satellites, if any, the purpose, publications, available audiovisuals, and newsletter title and/or frequency. (MSE)