The paper takes off from the problem of finding a proper content for the relation of identity as it holds or fails to hold among ordinary things or substances. The necessary conditions of identity are familiar, the sufficient conditions less so. The search is for conditions at once better usable than the Leibnizian Identity of Indiscernibles (independently suspect) and strong enough to underwrite all the formal properties of the relation.It is contended that the key to this problem rests at the (...) level of metaphysics and epistemology alike with a sortalist position. Sortalism is the position which insists that, if the question is whether a and b are the same, it has to be asked what are they? Any sufficiently specific answer to that question will bring with it a principle of activity or functioning and a mode of behaviour characteristic of some particular kind of thing by reference to which questions of persistence or non-persistence through change can be adjudicated.These contentions are illustrated by reference to familiar examples such as the human zygote, the Ship of Theseus and Shoemaker's Brown-Brownson. The first example is hostage for a mass of unproblematical cases. The problems presented by the second and third sort of examples arise chiefly (it is claimed) from an incompleteness in our conceptions of the relevant sort—the what the thing in question is. That incompleteness need not prevent us from knowing perfectly well which thing we are referring to. In the concluding section, sortalism is defended against various accusations of anthropocentrism.The paper touches on the interpretation of Heraclitus, Leibniz's theory of clear indistinct ideas, the difficulties of David Lewis's ‘perdurantist’ or stroboscopic view of persistence, four-dimensionalism, and the relation of personal identity both to experiential memory and to the particular bodily physiognomy of a subject. At some points—as in connection with the so-called Only a and b rule—the paper corrects, supplements or extends certain theses or formulations proposed in the author's Sameness and Substance Renewed (2001). (shrink)

RÉSUMÉ: Les actualistes ne partagent pas tous les mêmes intuitions quant aux mondes possibles. Cet article caractérise les intuitions platoniciennes et aristotéliciennes, et explore les conséquences pour l'actualiste d'accepter le platonisme ou l'aristotélisme. Les arguments en faveur de la conception aristotélicienne tiennent la route, mais pour répondre à certains problèmes concernant la vérité des négatives existentielles, l'actualisme aristotélicien doit rejeter l'actualisme des propriétés, c'est-à-dire la conception que seules les entités existantes ont des propriétés. Puisque les entités non existantes ont certaines (...) propriétés, l'actualisme aristotélicien sans actualisme des propriétés est la meilleure approche aux modalités. (shrink)

Over the last decades the traditional emphasis on moral rules, or principles, has been attacked by particularists like Jonathan Dancy. I argue that particularists are correct in rejecting traditional attempts at moral codification, but that it is still possible to have a rule-oriented approach to morality if we distinguish between different ways in which features can be morally relevant. I suggest that there are first a limited number of features that can serve as basic moral reasons for action, and then (...) a class of relational features that can change the relevance of these features. I then argue that while particularists do well in drawing attention to the fact that sometimes our basic moral duties are put out of play by other relevant features, they fail to make sense of the exceptional nature of such situations. Only a rule-oriented understanding of morality can do this. (shrink)