This document provides an overview of John Stuart Mill's utilitarian ethical theory. It discusses key aspects of Mill's view, including the principle of utility which holds that an action is right if it promotes the greatest happiness for the greatest number. The document also examines some objections to Mill's utilitarianism, such as issues with act-based versus rule-based versions of the view. It provides context on Mill's life and influences on his thought. Finally, it evaluates Mill's theory and considers further implications regarding the possibility of a science of morality.