The document summarizes MEASURE Evaluation's work to strengthen HIV/AIDS information systems at subnational levels in Nigeria. They worked in 3 states - Kano, Anambra, and Lagos - by deploying advisors, providing training and mentorship, collaborating with partners, and supporting improved data collection, reporting, and use. Key accomplishments included improved data reporting rates, populated databases, and strengthened monitoring and evaluation capacities at state and local levels. Lessons learned highlighted the benefits of working closely with government partners and preventing duplication of efforts.