This document provides an overview of the moral philosophy of utilitarianism as developed by Jeremy Bentham and John Stuart Mill. It discusses key concepts in Bentham's act utilitarianism including the principle of maximizing happiness or pleasure for the greatest number. It also covers Mill's modifications focusing on distinguishing higher and lower qualities of pleasure. The document outlines criticisms of utilitarianism and alternative formulations like rule utilitarianism. It analyzes debates around applying the utilitarian calculus and issues of personal integrity raised by critics like Bernard Williams.