Deontology
The ethical theory that the morality of an action depends on duty and rules rather than consequences, most associated with Immanuel Kant.
Deontology is the ethical theory that judges actions by their intrinsic rightness or wrongness — by whether they conform to duties and rules — rather than by their consequences. The word comes from the Greek deon, duty. Its most influential version is the moral philosophy of Immanuel Kant, developed in the Groundwork of the Metaphysics of Morals (1785). For Kant, the moral worth of an action lies in the will behind it: an action is good when it is done from duty, not merely in accordance with duty, and not because of the outcomes it produces.
The centerpiece is the categorical imperative, the supreme principle of morality, stated in several formulations. The universalizability formulation: act only according to that maxim through which you can at the same time will that it become a universal law — lying is wrong because a world in which everyone lied would make promising and truth-telling impossible. The humanity formulation: act so that you treat humanity, whether in your own person or in another, always as an end and never merely as a means. This grounds the deontological prohibitions against using people as tools, deception, and coercion, and it is the philosophical basis of the idea of human dignity and of rights that no utility calculation may override.
Kant's theory contrasts sharply with utilitarianism, which evaluates actions by their consequences for overall happiness. Where a utilitarian might justify lying to save a life if the balance of happiness favors it, a deontologist holds that lying is wrong regardless — consequences do not justify violating moral rules. This gives deontology its distinctive strengths and its characteristic criticisms: it offers robust protections against sacrificing individuals for the greater good, but critics argue that absolute rules produce intuitively wrong answers in hard cases, and that conflicts between duties (must I keep a promise or save a life?) need a decision procedure the theory does not obviously supply.
Contemporary deontology is more varied than Kant alone: W. D. Ross proposed a pluralism of prima facie duties (fidelity, reparation, gratitude, justice, beneficence, self-improvement, non-maleficence) that can be weighed when they conflict, and rights-based theories of the kind defended by Robert Nozick give individuals inviolable claims against being used as means. Deontological reasoning remains central to medical ethics (informed consent, not treating patients as means), law, and any domain where rules, rights, and respect for persons are taken as fundamental.
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duty ethics kant moral philosophy
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