Utilitarianism offers a relatively straightforward method for deciding the morally right course of action for any particular situation we may find ourselves in. To discover what we ought to do in any situation, we first identify the various courses of action that we could perform. Second, we determine all of the foreseeable benefits and harms that would result from each course of action for everyone affected by the action. And third, we choose the course of action that provides the greatest benefits after the costs have been taken into account.
The principle of utilitarianism can be traced to the writings of Jeremy Bentham, who lived in England during the eighteenth and nineteenth centuries. Bentham, a legal reformer, sought an objective basis that would provide a publicly acceptable norm for determining what kinds of laws England should enact. He believed that the most promising way of reaching such an agreement was to choose that policy that would bring about the greatest net benefits to society once the harms had been taken into account. His motto, a familiar one now, was "the greatest good for the greatest number."