This report presents the findings of studies in five countries to test the Anker Research Institute’s new methodology for measuring the size and determinants of gender pay gaps at workplaces in global supply chains. These studies involved analysis of payroll data for over 15,000 women and men working at 12 factories, farms, and packhouses in the garment and agri-food sectors, as well as over 350 interviews with workers, managers, and stakeholder organizations.