%0 Journal Article %T The Grit in the Oyster? Women¡¯s Parliamentary Organizations and the Substantive Representation of Women %A Peter Allen %A Sarah Childs %J Political Studies %@ 1467-9248 %D 2019 %R 10.1177/0032321718793080 %X This article addresses a foundational question of political representation: how do representatives act for those they represent? In a shift away from analyses of individual representatives¡¯ attitudes and behaviour, we identify Women¡¯s Parliamentary Organizations as potential critical sites and critical actors for women¡¯s substantive representation. Offering one of the most in-depth studies to date, our illustrative case is the long-standing UK Parliamentary Labour Party¡¯s Women¡¯s Committee. With a unique data set, and using both quantitative and qualitative methods, we systematically examine the Parliamentary Labour Party¡¯s Women¡¯s Committee efforts to substantively represent women over more than a decade. We find that the Committee sustains its focus on a small number of women¡¯s issues and interacts with party leadership to advance women¡¯s interests in a feminist direction. Our findings capture processes of political change, a frequently under-explored stage in studies of substantive representation. We close by identifying the potential for comparative research in this area %K women¡¯s substantive representation %K critical mass %K critical actors %K political change %K gender and politics %K feminizing %K women¡¯s parliamentary organizations %U https://journals.sagepub.com/doi/full/10.1177/0032321718793080