This report is a collection of evidence, brief examples highlighting the effect and benefits of placing women at the core of planning, implementation and operations of Water Sanitation Hygiene (WASH) programmes. It is is organized around six Big Issues: Better services for all; Better health for all; Privacy and dignity; Women's health and well-being; Girls' school attendance; Women's status; and Income-generation. The experiences also show how women's empowerment and the improvement of water supply, sanitation facilities and hygiene practice are inextricably linked. One cannot be successfully achieved without the other. The report provides further proof that if women play a central role in water, sanitation and hygiene efforts, progress towards achieving all the Millennium Development Goals will be significantly advanced. The evidence comes from a variety of sources, some of it from recent literature, project reports and evaluations and some from personal correspondence with those involved, where changes are currently happening but not yet documented.