 Most utilitarians have regarded it as part of their task in defending utilitarianism to show that it can both accommodate and explain much of what we intuitively believe about justice. This is certainly true of two of the greatest among them, John Stuart Mill and Sidgwick, both of whom went to considerable lengths to show that familiar principles of justice could be given a utilitarian rationale (Mill Utilitarianism, ch. 5; Sidgwick 1874/1907, Book III, ch.5). Bentham, in contrast, was more cavalier: ‘justice, in the only sense in which it has a meaning, is an imaginary personage, feigned for the convenience of discourse, whose dictates are the dictates of utility, applied to certain particular cases’ (The Principles of Morals and Legislation, pp. 125–6). If we follow the lead of Mill and Sidgwick in wishing to take seriously how justice is commonly understood, the utilitarian has two challenges to face. First he or she must show that the demands of justice as commonly understood correspond roughly to the rules that when followed by persons, or implemented by institutions, are most conducive to the greatest happiness. They need not mirror the latter exactly, because utilitarians will argue, as both Mill and Sidgwick did, that our intuitions about justice are often ambiguous or internally inconsistent, but there must be enough overlap to warrant the claim that what the utilitarian theory can accommodate and explain is indeed justice. (As Sidgwick (1874/1907, p. 264) put it, ‘we may, so to speak, clip the ragged edge of common usage, but we must not make excision of any considerable portion’.) Second, some explanation must be given for the distinctiveness of justice. Why do we have a concept that is used to mark off a particular set of requirements and claims if the normative basis for these requirements and claims is nothing other than general utility? What accounts for our intuitive sense of justice? The task confronting the utilitarian, then, is to systematize our understanding of justice without obliterating it.