Most Social Security disability claims are initially processed through a network of local Social Security Administration (SSA) field offices and State agencies (usually called Disability Determination Services or DDSs). Social Security representatives in the field offices usually obtain applications for disability benefits in person, by telephone, by mail, or by filing online. The application and related forms ask for a description of the claimant's impairment(s), treatment sources, and other information that relates to the alleged disability. (The "claimant" is the person who is requesting disability benefits.)