This report covers a progression of gender quota reforms in Latin America and the EU member countries, which were at the forefront of adopting gender quota reforms through legislated quotas and voluntary party quotas that increased the proportion of women parliamentarians. The case of the European Union (EU) provides an opportunity to see an institutional approach to gender equality, whereas the Latin American countries illustrate the region's overall commitment to gender equality and women's political representation. This report includes the best practices and challenges faced by countries from both regions but focuses on the role of quotas as enforcement mechanisms for women's political representation.