The various essays in this volume explore the development of ideas of corruption, employing a range of disciplinary approaches. Although we are accustomed to think of corruption as the misuse of public office for private gain, corruption has its deeper roots in the idea of a standard that has been eroded. That standard, however, need not be construed idealistically: much of what is asserted to be corruption takes the form of a departure from conventional standards. In inveighing against corruption, therefore, it is necessary first to examine the presumptions that underlie its imputation. As well as exploring the ethical issues that must be confronted in identifying corruption, the authors also address some of the ethical issues that challenge attempts to root out corruption.