This chapter maps out current trends in the composition of legislatures across the OECD while exploring remaining barriers to women running for elected office and equal access to leadership positions in legislatures. It also provides an overview of strategies, initiatives and mechanisms across the OECD to help political institutions become more gender sensitive and thus encourage women's political representation and access to leadership. Finally, the chapter assesses tools and frameworks to mainstream gender in the work of legislatures, including law-making and oversight.