The Gender-Migration Index (GMI) is a policy guidance tool that centers lived experiences of women, girl, LGBTQIA+, and gender diverse migrants by strengthening civil society engagement in international review processes. The Index is based on an indicator system that ensures gender-responsiveness and migrant-inclusion in benchmarking policy, particularly in regards to monitoring and evaluation. Through a multi-stakeholder approach, the GMI shrinks spaces between migrant communities and governing bodies and promotes dialogue and information-sharing by facilitating feedback and consultation mechanisms. The GMI is premised on participatory action research. Based on a paradigm to democratize knowledge production in policy, the GMI emphasizes participation and action by members of communities affected by the research - and policy - namely migrant communities and organizations working with migrant communities. As part of these efforts, the Center for Migration, Gender, and Justice analyzes the Overall and Policy Indicators, while migrant communities and organizations working with migrant communities analyze the Migration Experience Indicators. This three-part indicator structure informs collective engagement in international review processes. The application of the GMI is thus co-curated (methodology) with a concrete research-action trajectory that may result in varied outcomes (reports, policy briefs, campaigns, etc.). We launched the GMI during the 2022 International Migration Review Forum to ensure gender-responsiveness and migrant-inclusion in the implementation of the Global Compact for Migration (GCM). In developing the GMI, several sample case studies were conducted on Voluntary National Reviews (VNRs) on the GCM submitted by countries across different regions in order to offer comparative insights on gender-responsiveness at the global level. We have since completed the overall gender-responsiveness analysis for all countries across regions that submitted VNRs and have begun the analysis of Policy Indicators and Migration Experience Indicators. The GMI’s indicator system builds on the IOM’s Migration Governance Indicators and the UN Women’s Minimum Set of Gender Indicators. It is complementary to other efforts such as the Gender + Migration Hub and UN Women’s “Policies and Practice: A Guide to Gender-Responsive Implementation of the GCM.”