Pt. I. Skepticism -- 1. The Problem of the External World / Barry Stroud -- 2. Proof of an External World / G. E. Moore -- 3. Four Forms of Scepticism / 4. Certainty / 5. How a Pyrrhonian Skeptic Might Respond to Academic Skepticism / Peter Klein -- 6. Epistemological Realism / Michael Williams -- Pt. II. The Structure of Knowledge and Justification -- 7. The Myth of the Given / Roderick M. Chisholm -- 8. Does Empirical Knowledge Have a Foundation? / Wilfrid Sellars -- 9. Epistemic Principles / 10. Can Empirical Knowledge Have a Foundation? / Laurence BonJour -- 11. A Coherence Theory of Truth and Knowledge / Donald Davidson