Last reviewed 16 Sept 2026 · 9 min read
Key concepts
| Term | Meaning |
|---|---|
| Ethics | Systematic study of right and wrong conduct and moral principles guiding behaviour; often applied to professions (professional ethics) |
| Morals | Individual or societal beliefs about right and wrong, often shaped by culture, religion, upbringing |
| Values | Deeply held beliefs about what is important or desirable (honesty, safety, excellence) that guide choices |
| Law | Rules enforced by the state; ethics often exceeds legal minimum — legal is not always ethical, and some ethical duties are not legally enforced |
| Integrity | Consistency between one's values, words and actions; adherence to moral principles even when unobserved |
Types of values
- Personal values — honesty, discipline, compassion.
- Professional values — competence, public safety, integrity, confidentiality, accountability, objectivity, continuous learning.
- Societal/constitutional values — justice, liberty, equality, fraternity, secularism, dignity (Preamble of the Constitution).
- Organisational values — mission, quality, customer focus, safety culture.
Core human values for engineers
| Value | Application in engineering |
|---|---|
| Integrity | Refusing to certify substandard work; accurate reporting |
| Honesty and truthfulness | Correct test results, measurements and bills |
| Courage | Speaking up about unsafe designs or practices |
| Responsibility and accountability | Owning decisions and their consequences |
| Respect for others | Dignity of workers, communities, colleagues |
| Empathy and compassion | Considering affected people (displaced families, labourers' welfare) |
| Fairness and justice | Impartial tendering, equal opportunity |
| Transparency | Open procedures, disclosure of conflicts |
| Diligence and competence | Working within expertise, checking calculations |
| Commitment to sustainability | Protecting resources for future generations |
| Service to society | Public welfare above personal gain |
Ethical theories
| Theory | Key idea | Proponents | Engineering application / limitation |
|---|---|---|---|
| Utilitarianism (consequentialism) | Right action produces the greatest good for the greatest number; judged by consequences | Jeremy Bentham, John Stuart Mill | Cost–benefit analysis of projects; limitation — may ignore rights of minorities (e.g. displaced people) |
| Deontology (duty ethics) | Actions are right or wrong in themselves based on duties and rules, regardless of consequences; categorical imperative — act only on maxims you would want as universal law; treat people as ends, never merely as means | Immanuel Kant | Duty to tell the truth, keep contracts, protect safety; limitation — conflicting duties |
| Virtue ethics | Focus on character — cultivate virtues (honesty, courage, prudence, justice); the "golden mean" between extremes | Aristotle | Being a good engineer, not just following rules |
| Rights ethics | People have fundamental rights (life, liberty, safety, information) that must be respected | John Locke (natural rights) | Informed consent, right to a safe workplace |
| Justice/fairness ethics | Fair distribution of benefits and burdens; social contract | John Rawls (justice as fairness) | Equitable siting of hazardous facilities, fair compensation |
| Care ethics | Emphasis on relationships and care for vulnerable people | Carol Gilligan, Nel Noddings | Community engagement, worker welfare |
| Ethical egoism | Pursue one's own long-term self-interest | — | Often inadequate for professional ethics |
In practice, engineers combine perspectives — checking consequences, duties/codes, rights and character.
Moral development
Kohlberg's stages of moral development
| Level | Stages | Motivation |
|---|---|---|
| Pre-conventional | 1. Obedience and punishment; 2. Self-interest (instrumental exchange) | Avoid punishment, gain rewards |
| Conventional | 3. Interpersonal conformity ("good boy/girl"); 4. Law and order (authority, social order) | Approval, following rules |
| Post-conventional | 5. Social contract and individual rights; 6. Universal ethical principles | Principled reasoning — professionals should aim for this level |
Gilligan's critique emphasised an ethics of care and relationships alongside justice-based reasoning.
Moral autonomy
The ability to think critically and independently about moral issues and apply moral reasoning in professional situations — not merely obeying authority.
Engineering ethics
Engineering ethics — study of moral issues and decisions confronting engineers and organisations engaged in engineering, and the justification of related ideals, obligations and policies.
Why engineers need ethics
- Engineering decisions affect public safety, health and welfare on a large scale (bridges, dams, buildings, water supply).
- Engineers hold specialised knowledge that the public relies on (information asymmetry).
- Pressures of cost, schedule and clients can conflict with safety and quality.
- Public trust in the profession depends on ethical conduct.
Engineering as social experimentation
- Every new project is like an experiment with uncertain outcomes on the public (Martin and Schinzinger).
- Responsibilities of engineers as responsible experimenters:
- Conscientious commitment to protect the safety of human subjects and respect their right of consent.
- Comprehensive perspective on consequences.
- Autonomous, personal involvement in all steps.
- Accountability for results.
- Informed consent — affected people should know risks and agree voluntarily.
Safety and risk
- Safety — risk that is judged acceptable; no activity is risk-free.
- Factors in acceptable risk: voluntary vs involuntary, short vs long-term effects, probability, reversibility, threshold levels, delayed vs immediate harm.
- Engineers must identify hazards, assess risks, use factors of safety, redundancy, and fail-safe designs, and communicate risks honestly.