Ipsos presented emerging findings from an evaluation of Gavi's contribution to reach zero-dose (ZD) and missed communities through its 5.0/ 5.1 strategy period (through 2025). The current phase of the evaluation has five focus priority topics, and the presentation focused on two areas: the integration of immunization initiatives with primary health care (PHC) systems and the role of advocacy in driving political commitment to the ZD agenda. Methods are mixed (review of secondary data and documents and stakeholder interviews). Findings highlight both the successes and challenges with PHC integration and how it relates to health systems or ZD outcomes. There is not a common definition of advocacy or its approaches, making it difficult to identify best practices in this area.