Researchers believe that several factors interact to produce scleroderma, including abnormal immune activity, potential environmental triggers, and genetic makeup. Scleroderma is not passed on from parents to child, but certain genes may make a person more likely to develop the disease. The goals of this project are to identify the genes that influence disease susceptibility and expression in systemic scleroderma and to establish a repository of DNA, plasma, and serum samples from single case scleroderma families, multicase families, and healthy unrelated volunteers for the use of researchers interested in studying this disease.