Is utilitarianism a just principal?
Background and context
Utilitarianism is the idea that the moral worth of an action is determined solely by its contribution to overall utility: that is, its contribution to happiness or pleasure as summed among all people. It is thus a form of consequentialism, meaning that the moral worth of an action is determined by its outcome. Utility, the good to be maximized, has been defined by various thinkers as happiness or pleasure (versus suffering or pain), although preference utilitarians like Peter Singer define it as the satisfaction of preferences. It may be described as a life stance, with happiness or pleasure being of ultimate importance.
See Wikipedia's article on Utilitarianism for more background.