Joan Tronto's Moral Boundaries. A Political Argument for an Ethic of Care (1993) is one of the most influential works in the short history of the ethics of care. In her book, Tronto rethinks 'care' as one of the central activities of human life and explains that it is shaped through politics. Since it is two decades ago that Moral Boundaries was published it seems more than worthwhile to take stock of its significance. This volume does so. It attempts to redraw the moral boundaries Tronto discusses and explores the impact and meaning of her thinking for care ethics as a developing discipline. This volume celebrates the anniversary of a book. Our 'author of honour' is Joan Tronto herself. The contributions of the other authors concentrate on three domains: political theory, professional ethics and the understanding of care as practice.