Part I. Modality: 1. Ruth Barcan Marcus and the Barcan Formula Terence Parsons; 2. The interaction of modality with quantification and identity Robert Stalnaker; 3. S1 is not so simple Maxwell J. Cresswell; 4. A problem in possible-world semantics David Kaplan; 5. Senses of essence Kit Fine; 6. Structuralism and the concept of set Charles Parsons; 7. The Kant-Frege-Russell view of existence David Wiggins; Part II. Morality: 8. Moral dilemmas revisited Philippa Foot; 9. Perspectival Guilt Patricia S. Greenspan; 10. Instigating the unpredisposed Joel Feinberg; 11. Marcus and the problem of nested deontic modalities Nuel Belnap and Paul Bartha; Part III. Belief: 12. Pierre, Saul, Ruth and Bob and a puzzle about belief Robert J. Fogelin; 13. Closure and consistency Issac Levi; 14. De Re Belief, action explanations and the essential indexical Ernest Sosa; 15. T-sentences Scott Soames.

"In an intersting and wide-ranging discussion, Parsons surveys various explanations and justifications provided by mathematicians and philosophers, concluding that ontological features do not play an essential role in the development of ZF, and need not be taken to be part of the literal truth about sets." Philip Bricker, Journal of Symbolic Logic