This 20-page file presents a comprehensive overview of the most important topics related to the Unified Registry for Social Programs (CadÚnico), containing executive summary, implementation history, actors involved, programs, beneficiaries, legislation, among others. The Unified Registry is the tool for the identification and socioeconomic characterization of low-income families that can be used for social programs and policies in the selection of their beneficiaries and for mapping of needs and vulnerabilities.