Introduction; 1. Naturalism in moral philosophy Gilbert Harman; 2. Normativity and reasons: five arguments from Parfit against normative naturalism David Copp; 3. Naturalism: feel the width Roger Crisp; 4. On ethical naturalism and the philosophy of language Frank Jackson; 5. Metaethical pluralism: how both moral naturalism and moral skepticism may be permissible positions Richard Joyce; 6. Moral naturalism and categorical reasons Terence Cuneo; 7. Does analytical moral naturalism rest on a mistake? Susana Nuccetelli and Gary Seay; 8. Supervenience and the nature of normativity Michael Ridge; 9. Can normativity be naturalized? Robert Audi; 10. Ethical non-naturalism and experimental philosophy Robert Shaver; 11. Externalism, motivation, and moral knowledge Sergio Tenenbaum; 12. Naturalism, absolutism, relativism Michael Smith.