Utilitarianism is an effort to provide an answer to the practical question “What ought a man to do?” Its answer is that he ought to act so as to produce the best consequences possible.
In the notion of consequences the Utilitarian includes all of the good and bad produced by the act, whether arising after the act has been performed or during its performance. If the difference in the consequences of alternative acts is not great, some Utilitarian do not regard the choice between them as a moral issue. According to Mill, acts should be classified as morally right or wrong only if the consequences are of such significance that a person would wish to see the agent compelled, not merely persuaded and exhorted, to act in the preferred manner. In assessing the consequences of actions, Utilitarianism relies upon some theory of intrinsic value: something is held to be good in itself, apart from further consequences, and all other values are believed to derive their worth from their relation to this intrinsic good as a means to an end. Bentham and Mill were hedonists; i.e., they analysed happiness as a balance of pleasure over pain and believed that these feelings alone are of intrinsic value and disvalue. Utilitarian also assume that it is possible to compare the intrinsic values produced by two alternative actions and to estimate which would have better consequences. Bentham believed that a hedonic calculus is theoretically possible. A moralist, he maintained, could sum up the units of pleasure and the units of pain for everyone likely to be affected, immediately and in the future, and could take the balance as a measure of the overall good or evil tendency of an action. Such precise measurement as Bentham envisioned is perhaps not essential, but it is nonetheless necessary for the Utilitarian to make some interpersonal comparisons of the values of the effects of alternative courses of action.
As a normative system providing a standard by which an individual ought to act and by which the existing practices of society, including its moral code, ought to be evaluated and improved, Utilitarianism cannot be verified or confirmed in the way in which a descriptive theory can; but it is not regarded by its exponents as simply arbitrary. Bentham believed that only in terms of a Utilitarian interpretation do words such as “ought,” “right,” and “wrong” have meaning and that whenever anyone attempts to combat the principle of utility, he does so with reasons drawn from the principle itself. Bentham and Mill both believed that human actions are motivated entirely by pleasure and pain; and Mill saw that motivation as a basis for the argument that, since happiness is the sole end of human action, the promotion of happiness is the test by which to judge all human conduct. One of the leading Utilitarian of the late 19th century, a Cambridge philosopher, Henry Sidgwick, rejected their theories of motivation as well as Bentham’s theory of the meaning of moral terms and sought to support Utilitarianism by showing that it follows from systematic reflection on the morality of “common sense.” Most of the requirements of commonsense morality, he argued, could be based upon Utilitarian considerations. In addition, he reasoned that Utilitarianism could solve the difficulties and perplexities that arise from the vagueness and inconsistencies of commonsense doctrines.
Most opponents of Utilitarianism have held that it has implications contrary to their moral intuitions–that considerations of utility, for example, might sometimes sanction the breaking of a promise. Much of the defence of Utilitarian ethics has consisted in answering these objections, either by showing that Utilitarianism does not have the implications that they claim it has or by arguing against the moral intuitions of its opponents. Some Utilitarian, however, has sought to modify the Utilitarian theory to account for the objections.
One such criticism is that, although the widespread practice of lying and stealing would have bad consequences, resulting in a loss of trustworthiness and security, it is not certain that an occasional lie to avoid embarrassment or an occasional theft from a rich man would not have good consequences, and thus be permissible or even required by Utilitarianism. But the Utilitarian readily answers that the widespread practice of such acts would result in a loss of trustworthiness and security. To meet the objection to not permitting an occasional lie or theft, some philosophers have defended a modification labelled “rule” Utilitarianism. It permits a particular act on a particular occasion to be adjudged right or wrong according to whether it is in accordance with or in violation of a useful rule; and a rule is judged useful or not by the consequences of its general practice. Mill has sometimes been interpreted as a “rule” Utilitarian, whereas Bentham and Sidgwick were “act” Utilitarian.
Another objection, often posed against the hedonistic value theory held by Bentham, holds that the value of life is more than a balance of pleasure over pain. Mill, in contrast to Bentham, discerned differences in the quality of pleasures that made some intrinsically preferable to others independently of intensity and duration (the quantitative dimensions recognized by Bentham). Some philosophers in the Utilitarian tradition have recognized certain wholly nonhedonistic values without losing their Utilitarian credentials. A British philosopher, G.E. Moore, a pioneer of 20th-century Analysis, regarded many kinds of consciousness–including love, knowledge, and the experience of beauty–as intrinsically valuable independently of pleasure, a position labelled “ideal” Utilitarianism. Even in limiting the recognition of intrinsic value and disvalue to happiness and unhappiness, some philosophers have argued that those feelings cannot adequately be further broken down into terms of pleasure and pain and have thus preferred to defend the theory in terms of maximizing happiness and minimizing unhappiness. It is important to note, however, that even for the hedonistic Utilitarian, pleasure and pain are not thought of in purely sensual terms; pleasure and pain for them can be components of experiences of all sorts. Their claim is that, if an experience is neither pleasurable nor painful, then it is a matter of indifference and has no intrinsic value.
Another objection to Utilitarianism is that the prevention or elimination of suffering should take precedence over any alternative act that would only increase the happiness of someone already happy. Some recent Utilitarian has modified their theory to require this focus or even to limit moral obligation to the prevention or elimination of suffering–a view labelled “negative” Utilitarianism.