NIMHD’s Division of Intramural Research is conducting small-business market research for a potential IDIQ contract to provide R&D social and behavioral sciences research services supporting population health and clinical research on health disparities in the United States. The contractor would design, conduct, oversee, and manage multiple concurrent studies and task orders, including recruitment, site/subcontractor management, IRB/regulatory compliance, community engagement, data collection/analysis, and protocol development. Work may involve cross-sectional surveys, epidemiologic studies, clinical trials, community interventions, simulation modeling, and qualitative methods across studies ranging from about 100 to 10,000 participants. The effort is assigned NAICS 541715 with a 1,000-employee size standard, and the government anticipates awarding the IDIQ around September 2027. This is a sources-sought notice, not a solicitation; interested small businesses are asked to provide capability statements and may also comment on the draft SOW and commercial availability.