This booklet is an EFC (European Foundation Centre) thematic network's first collaborative piece of work. It presents collected case studies on foundation grantmaking programmes where using a gender lens made a real difference to the people concerned. Criminal justice, climate change, migration, labour rights, workers' health and disability are the foundation programme areas discussed. Indeed, these diverse areas, all equally important, have something in common: they were all approached through a gender lens which allows each foundation to fully understand the issues it tackles, and adapt its response accordingly. This publication addresses what a gender lens is and how a foundation can use it; And tries to answer some questions.