Currently, however, across countries, it is those women and girls who experience multiple and intersecting forms of discrimination who are often the furthest behind. They fare worse than all other groups in key dimensions of well-being. Differences related to wealth, location and ethnicity, for example, combine to create deep pockets of deprivation across a range of SDGs— from access to education and health to clean water and decent work. They transcend national borders and have been the topic of landmark human rights treaties and Human Rights Council resolutions, but data on women and girls that experience these forms of discrimination are often lacking. This will make it possible to inform and develop policies and programmes that respond to their realities. But disaggregation by sex alone is insufficient.