Over the past 15 years, gender quota debates have emerged in national politics all over the world. More than 40 countries have reformed their constitutions or passed new electoral laws requiring that women comprise certain percentages of aspirants, candidates, or legislative seats, while in many other countries, political parties have adopted quotas on their own. This phenomenon raises both normative and empirical questions, ranging from whether gender quotas are appropriate to why countries adopt them and how effective they have been. Drude Dahlerup's edited book addresses these concerns with the first worldwide compilation of gender quota studies. The editor brings together a diverse group of authors who examine quotas in seven regions of the world, and she brackets their contributions with theoretical chapters on quota adoption and implementation. The result is the most comprehensive resource on gender quotas to date.