Ethical disagreement is a fact of social life. We disagree about issues such as abortion, euthanasia, the meaning of justice and the treatment of animals, and our debates often fail to reach a consensus. Some philosophers think that this means there is no objective knowledge about morality. Discourse and Knowledge takes a radically different approach to the defence of ethical rationality. It claims that there is a correct solution to ethical controversies, but that ethical decisions have to be made collectively. Written specifically for those studying or teaching ethics or moral theory, Discourse and Knowledge will also be ideal for those on courses on social theory, ethics or feminist philosophy.