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The utilitarian ethical theory has a long history. Many of the elements can be found in the 18th-century work of David Hume. A classical statement of the theory and its application to law was published by Jeremy Bentham in 1789. The most famous defense was written by John Stuart Mill in 1863. In the 20th century, there have been many defenders of the theory, although there has also been powerful criticism. Defenders include R. M. Hare and Richard Brandt. Critics include John Rawls and Robert Nozick.
In general, utilitarianism teaches that each of our actions, or each type of action, is good or bad in so far as it tends to increase or decrease human well-being. In Bentham's words, "an action . . . may be said to be conformable to the principle of utility, . . . when the tendency it has to augment the happiness of the community is greater than any it has to diminish it."

Since Bentham's time, the idea of well-being used by utilitarians has changed. Utilitarians today would probably refer to human welfare or to the satisfaction of human preferences or choices rather than happiness.


Utilitarian theories are usually divided into two types called act utilitarian and rule utilitarian. An act utilitarian believes that in any given situation the best action to perform is the action that will maximize human welfare. A rule utilitarian believes that we should think in terms of types of acts rather than individual actions. Moral rules should be phrased in terms of types of acts and in a given situation we should follow the rules that will maximize human welfare in the long run. A rule utilitarian can allow that in a specific situation, a specific act is the proper act to perform (because it is dictated by the rules that apply) and yet allow that some other act would maximize human welfare.
There have been a great many criticisms of utilitarianism. For example, John Rawls has argued that utilitarianism "does not take seriously the distinction between persons" because it focuses on the sum of satisfactions. J. L. Mackie has argued that the utilitarian idea of a measurable and comparable entity called happiness is a myth. Robert Nozick has suggested that utilitarian theory has trouble dealing with the possibility of "utility monsters" who gain enormously from the sacrifices of others. To develop your own understanding of the standard types of ethical theory, read these philosophers and, of course, their critics.