1. Synopsis 2. The Nature of Modality 3. Absolute Necessity and Iterated Modality 4. On the Contingency of Worlds 5. A Theory of Worlds 6. Essence, Laws, and Explanation 7. Metaphysical and Nomic Necessity 8. Standards of Closeness 9. Clarifications, Additions, and Objections 10. Causation, Nomic Determination, and the Counterfactual Test 11. On the Genealogy of Modality 12. Extensions and Limitations of the Counterfactual Test References Index
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