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Consequentialism is the family of normative ethical theories holding that the moral rightness of an action is determined entirely by its consequences. What matters morally is the state of the world an action brings about—its effects on well-being, preference satisfaction, knowledge, or other valued outcomes. Different versions disagree about what counts as a good outcome (hedonism, preference satisfaction, objective list theories) and whose outcomes count (all sentient beings, all persons, only those affected). Consequentialism faces objections about integrity, rights violations, and demandingness: it can appear to justify sacrificing individuals for aggregate gain.
Work through classic cases: does it justify lying to save lives? Sacrificing one to save five? Contrast consequentialist answers with deontological and virtue-based answers. Reading Mill's Utilitarianism and then Bernard Williams's critique in Utilitarianism: For and Against is a productive pairing.
You have studied argument structure — the ability to identify premises, inferences, and conclusions — and have some background in metaethics. Consequentialism is the moral theory that applies the most straightforward-seeming logic to ethics: the right action is the one that produces the best outcome. What makes it a family of theories rather than a single theory is that "best outcome" can be defined in many ways — and reasonable consequentialists disagree about both what counts as good and whose good counts.
The foundational claim is that moral evaluation belongs to outcomes, not to intrinsic features of acts. Lying is not intrinsically wrong; it is wrong when and because it produces bad consequences — harm, distrust, diminished well-being. When lying would save lives, that same act becomes permissible or even required. This is the move that distinguishes consequentialism from deontological theories, which hold that some acts (lying, killing an innocent person) are wrong regardless of outcomes. For a consequentialist, no act is categorically forbidden — only acts that reliably produce bad outcomes are prohibited, and that prohibition is contingent on the facts, not absolute.
The most historically influential consequentialist theory is utilitarianism (Mill, Bentham), which defines the good in terms of well-being or happiness and holds that we should maximize the total or average happiness of all affected parties. But consequentialism is broader: some versions value preference satisfaction (what people want, not just what feels good), others adopt objective list theories (knowledge, friendship, and achievement are good independently of whether they are wanted or felt as pleasant), and some extend moral consideration to all sentient beings, not just persons. The choice among these accounts matters practically: a hedonistic utilitarian might endorse policies that a preference-satisfaction consequentialist would reject, because the two accounts can come apart in real cases.
The most serious objections concern consequentialism's apparent willingness to violate individual rights for aggregate gain. The trolley problem tests your intuitions here: most people accept diverting a trolley to kill one rather than five (apparently consequentialist), but fewer accept pushing a large man off a bridge to stop it (same arithmetic, more visceral). Bernard Williams argued that consequentialism violates integrity: it treats your own causal contribution to an outcome as morally equivalent to another person's, erasing the morally significant distinction between what you do and what you merely allow. Sophisticated consequentialists — rule consequentialists, indirect consequentialists — respond by arguing that adopting rules that protect rights tends to produce better outcomes than case-by-case calculation, so rights-respecting behavior is itself consequentially justified. This is the live debate: is a rights-respecting consequentialism still genuinely consequentialist, or has it imported deontological constraints through the back door?
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