Social Security, in the United States, currently refers to the Federal Old-Age, Survivors, and Disability Insurance (OASDI) program. The original Social Security Act[1] and the current version of the Act, as amended encompass several social welfare or social insurance programs. The larger and better known initiatives of the program are: Federal Old-Age, Survivors, and Disability Insurance; Unemployment Insurance; Temporary Assistance to Needy Families; Health Insurance for Aged and Disabled (Medicare); Grants to States for Medical Assistance Programs (Medicaid); State Children's Health Insurance Program (SCHIP); Supplemental Security Income (SSI). Social Security in the United States is a social insurance program funded through dedicated payroll taxes called Federal Insurance Contributions Act (FICA). The term, in everyday speech, is used only to refer to the benefits for retirement, disability, survivorship, and death, which are the four main benefits provided by traditional private-sector pension plans. By dollars paid, the U.S. Social Security program is the largest government program in the world. Largely because of solvency questions ranging from immediate crisis to large projected future shortfalls, reform of the Social Security system has been a major political issue for more than three decades. This book presents the latest issues and developments related to this program.