: This article explores certain issues that arise at the borderline between conceptual analysis and metaphysics, where answers to questions of a conceptual nature compete with answers to questions of an ontological or metaphysical nature. I focus on the way in which three philosophers, Kant, Collingwood and Davidson, articulate the relationship between the conceptual question "What are actions?" and the metaphysical question "How is agency possible?" I argue that the way in which one handles the relationship between the conceptual and (...) the ontological question has important implications for one’s conception of the nature of philosophy, and that thinking hard about what it takes to defend the autonomy of the mental and of the agent-centred perspective should force us to think about our underlying conception of philosophy and to choose between one that understands it as first science and one that understands it as the under-labourer of science. (shrink)