A professional responsible for interviewing families and completing registration forms at family households and at service centers for families regarding the Single Registry (Cadastro Único); provides information to families affected by the interview process and the objectives of the Single Registry; carries out screening activities; identifies needs and guides families on programs linked to the Single Registry; directly enters data into the Single Registry system and/or types information into the system after conducting paper-based interviews. **Administer questionnaires:** Identify oneself to the interviewee/family head; manually and digitally complete questionnaires/forms; verify validation of the Single Registry in the system; collect demographic and socioeconomic information at households; complete spreadsheets and other tools provided; archive Single Registry forms; Register families at their households; indicate exclusions and modifications to registrations; register, update, and re-register families; **Verify information consistency:** Check for completion errors in questionnaires/forms; correct, verify, and validate collected information. **Carry out screening:** Interview the family head; schedule home visits; clarify doubts; Identify the family’s situation and head based on official documents; Explain the objectives of the Single Registry; identify the family’s needs; refer to competent agencies when necessary; organize information and documents for internal control; guide families on social programs and public policies; conduct active outreach to families; Interview families at their households, shelters/institutions, external locations, and communities; verify the accuracy of information at households; serve traditional and specific population groups (e.g., Indigenous villages, Quilombola communities, undocumented persons, among others); participate in mass registration events and mobile outreach actions; Safeguard and preserve confidentiality of workplace information as well as information provided by users; Provide users with necessary guidance on all social programs using the Social Identification Number (NIS) and the eligibility criteria for accessing them; advise families on procedures required to maintain their Single Registry registration. **Operationalize systems:** Operate web/online systems related to the Single Registry and the Bolsa Família Program (Federal Government system).