This paper proposes a problem-based approach to theorizing about global justice as opposed to what I call a paradigm-based approach. The latter confronts questions of global justice from an established ideal of justice normally constructed for the domestic context. The problem-based approach engages global justice issues without the presumption that that they must be accessible from an established (domestic) framework of justice. One advantage of the problem-based approach is that it does not foreclose engagement with practical matters (by defining some issues, such as global equality, as non-problems); another is that it has a more reflective and revisionary approach to theorizing about justice (as when new challenges compel re-examination of our established theories of justice).