Reliability, Safety, Ethics, and Governance
Engineering Under Risk and Uncertainty
Safety as an Engineering Objective
Safety is not the absence of failure but the disciplined management of risk. Engineering safety analysis integrates hazard identification, probability models, failure modes, human factors, and layered defenses.
Important Concepts
What is the main purpose of redundancy in critical systems?
Redundancy improves fault tolerance and resilience.
Correct answer: To provide alternative paths when one component fails
Why are human factors important in engineering safety?
Many accidents arise from socio-technical interactions rather than isolated technical faults.
Correct answer: Because operator behavior, interface design, and organizational processes can strongly influence failure and recovery.
Ethical Frontier
As engineering systems increasingly shape mobility, communication, energy, and medicine, fairness, transparency, privacy, and accountability become first-order design constraints.
Safety Cases and Governance Tools
Technical verification
- Tests whether a design meets specifications
- May not capture real-world usage conditions
Safety case
- Structured argument for acceptable risk
- Combines evidence, assumptions, and justification
Which activity best reflects a systems safety approach?
Systems safety requires integrating technical and organizational perspectives.
Correct answer: Analyzing hazards, operational context, and recovery mechanisms together
What is a safety case?
Safety cases are common in high-risk domains such as aviation and rail.
Correct answer: A structured, evidence-based argument that a system is acceptably safe for a defined context.