This article contains the latest information on the historical development and present status of all the major U.S. social insurance and public aid programs under the Social Security Act: the Social Security program (Old-Age, Survivors, and Disability Insurance); Railroad Retirement; Public Employee Retirement; Unemployment Insurance; Workers' Compensation; State programs for Temporary Disability Insurance; Medicare; Medicaid; Supplemental Security Income; Food Stamps; Aid to Families with Dependent Children; Supplemental Food Program for Women, Infants, and Children; School Lunches; Low-Income Home Energy Assistance; General Assistance; Public and Other Subsidized Housing; and Earned Income Tax Credit. The poverty income guidelines for 1993 are also presented.