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Data-informed decision-making means that data is converted into usable information through processing, analysis, synthesis, interpretation, and review and discussion. In the case of health data, most of the data is generated from various essential programmes, and it is challenging for health leaders and managers to gather and utilize this information to decide an appropriate course of action. In the subfield of immunization, managing health data or health information system means using data and information on vaccine supply to prevent stockouts or using individual-level patient data to decide which patients or communities to target for vaccine and health outreach.