Introduction. Modal matters : philosophical significance / Otávio Bueno and Scott A. Shalkowski -- Possible worlds / Michael De -- Actualism / Karen Bennett -- Counterfactual conditionals / Dorothy Edgington -- Impossibility and impossible worlds / Daniel Nolan -- Origins of logical space / Brian Leftow -- Essentialism and modality / Penelope Mackie -- De re modality / Boris Kment -- Relativized metaphysical modality : index and context / Benj Hellie, Adam Russell Murray, and Jessica Wilson -- Ontological dependence, grounding, and modality / Fabrice Correia -- Modalism / Scott A. Shalkowski -- Modal anti-realism / John Divers -- Modal conventionalism / Ross Cameron -- Norms and modality / Amie Thomasson -- The integration challenge / Sonia Roca-Royes -- The epistemic idleness of conceivability / M. Oreste Fiocco -- Epistemology, the constitutive, and the principle-based account of modality / Christopher Peacocke -- Counterfactual-based approach / Tim Williamson -- Modality and a priori knowledge / Albert Casullo -- Intuition and modality : a disjunctive-social account of intuition-based justification in the epistemology of modality / Anand Vaidya -- Modality and scientific structuralism / Steven French -- Laws of nature, natural necessity, and counterfactual conditionals / Marc Lange -- Natural kinds and modality / Alexander Bird -- Modality in physics / Samuel C. Fletcher -- Physical and metaphysical modality / Ned Hall -- Modality in mathematics / Øystein Linnebo and Stewart Shapiro -- Modal set theory / Christopher Menzel -- The logic of metaphysical modality / Bob Hale -- Modality and the plurality of logics / Otávio Bueno -- Ancient Greek modal logic / Robin Smith -- Modality in medieval philosophy / Stephen Read -- Modality in Descartes's philosophy / Alan Nelson -- Hume on modality / Peter Millican -- Kant on real possibility / Nick Stang -- Quine on modality / Roberta Ballarin -- Kripke on modality / John Burgess.