David Lewis (1941- 2001) was Professor of Philosophy at Princeton University. His publications include Convention (reissued by Blackwell 2002), Counterfactuals (reissued by Blackwell 2000), Parts of Classes (1991), and of numerous articles in metaphysics and other areas. Many of his writings are available in his Collected Papers.

• Preface. 1. A Philosopher's Paradise.The Thesis of Pluraliry of Worlds.Modal Realism at Work: Modality.Modal Realism at Work: Closeness.Modal Realism at Work: Content.Modal Realism at Work: Properties.Isolation.Concreteness.Plenitude.Actuality.2. Paradox in Paradise?.Everything is Actual?.All Worlds in One?.More Worlds Than There Are?.How Can We Know?.A Road to Scepticism?.A Road to Indifference?.Arbitrariness Lost?.The Incredulous Stare.3. Paradise on the Cheap?.The Ersatzist Program.Linguistic Ersatzism.Pictorial Ersatzism.Magical Ersatzism.4. Counterparts or Double Lives?.Good Questions and Bad.Against Overlap.Against Trans-World Individuals.Against Haecceitism.Against Constancy.Works Cited.Index.