Ernest Sosa is a Professor of Philosophy at Brown University and Rutgers University. He is author of Knowledge in Perspective (Cambridge University Press, 1991) and of papers in metaphysics and epistemology.Enrique Villanueva is a Research Fellow at the Instituto de Investigaciones Juridicas, Universidad Nacional Autonoma de Mexico. He is author of papers and books in philosophy of mind and history of philosophy, and editor of Philosophical Issues from 1992 to 2000.

• Part I: Metaphysis and Logic:. 1. Realism and Relativism: Akeel Bilgrami.2. Underdetermination and Realism: Michael Devitt.3. Quantifier Variance and Realism: Eli Hirsch.4. Conceptual Relativity and Metaphysical Realism: Terry Horgan and Mark Timmons.5. Response-dependence without Tears: Frank Jackson and Philip Pettit.6. Is there a True Metaphysics of Material Objects? Alan Sidelle.7. Knowledge of the World: Galen Strawson.8. The Number of Things: Peter van Inwagen.9. On Logical Relativity: Achille C. Varzi.10. Abstract Objects: A Case Study: Stephen Yablo.Part II: Metaethics:.11. Meta-Ethics and Normative Commitment: James Dreier.12. Earning the Right to Realism or Relativism in Ethics: Carol Rovane.13. Moral Realism and Indeterminacy: Stephen Schiffer.14. Moral Relativity and Intuitionism: Walter Sinnott-Armstrong.15. Exploring the Implications of the Dispositional Theory of Value: Michael Smith.Contributors.