<p>We used CDC’s 2001 Updated Guidelines for Evaluating Public Health Surveillance Systems. We purposively interviewed 25 key informants. We also analyzed the Adamawa State measles surveillance data from 2017- 2020 to assess usefulness, representativeness, and data quality/completeness and calculate the Non-Measles-Febrile- Rash-Illness rate (NMFRI)</p>