Rawls' Principles of Utilitarianism

Rawls is writing at a time in which he thinks that the philosophy of utilitarianism is the dominant working philosophy. He's deeply disturbed by the problems of utilitarianism and thinks that there are lots of problems he sees with utilitarianism. The principles that he developed are quite different from utilitarianism, they don't allow for the aggregation of individual well-being into, as it were, a social whole.