System Safety Engineering Principles

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Questions and Answers

What is considered in the identification of requirements in the System Requirements Definition Process?

Resilience and other adversity-driven considerations (correct)

Stakeholder needs

System architecture

Adversity-driven considerations

Which process includes the evaluation of alternative solution classes for the ability to deliver required capabilities under adversity?

Stakeholder Needs and Requirements Definition Process

Operational concept scenarios

System Architecture Definition Process

Business or Mission Analysis Process (correct)

What does the Operational concept scenarios include in relation to resilience?

Identification of adversities and performance expectations

Stakeholder resilience needs

Resilience scenarios (correct)

System architecture

Who are part of the stakeholder set in the Stakeholder Needs and Requirements Definition Process?

Persons who understand potential adversities and stakeholder resilience needs Signup and view all the answers

What significantly limits and guides the range of acceptable architectures in the System Architecture Definition Process?

Achieving resilience and other adversity-driven considerations Signup and view all the answers

Which process handles risks and opportunities identified by resilience activities?

Risk Management Process Signup and view all the answers

What is the form of resilience requirements according to the text?

All of the above Signup and view all the answers

What are the three categories of transitions between system states as mentioned in the text?

Robustness, tolerance, recovery Signup and view all the answers

According to the text, what approach supports the circular economy throughout a product's life cycle?

Sustainability Engineering Signup and view all the answers

Which architectural technique is specifically mentioned for achieving resilience in the text?

All of the above Signup and view all the answers

What is the role of safety management in system safety engineering?

Minimizing hazards through design, technical mitigations, or procedural controls to reduce likelihood or impact of accidents Signup and view all the answers

What does system safety engineering require for effectiveness?

Qualified people, effective processes, appropriate governance, and culture Signup and view all the answers

Why can safety not be guaranteed 100% in system safety engineering?

Hazards may be unknown or uneliminable Signup and view all the answers

What is the importance of recognizing dependencies between hazards in safety decision-making?

To make safety decisions more effective Signup and view all the answers

How do regulators assess safety risk in system safety engineering?

In terms of both likelihood and severity of harm Signup and view all the answers

What does the safety engineering process aim to achieve by integrating tightly with the wider engineering and business processes?

Reducing the risk of incorrect assumptions Signup and view all the answers

Why should SE practitioners exercise caution when employing Agile for safety critical systems, according to Akroyd-Wallis (2018)?

Agile may introduce risks in safety critical systems Signup and view all the answers

What is a specific safety engineering consideration during System Architecture Definition?

Identification of potential hazards with the system Signup and view all the answers

What drives the effectiveness of a safety management system, according to the text?

Suitably qualified and experienced personnel Signup and view all the answers

Why do safety practitioners need to be in the room when key decisions are made, according to the text?

To lead the safety decision making and capture key information in an audit trail Signup and view all the answers

In the circular economy, what production and consumption model is emphasized?

Sharing, reusing, repairing, and recycling Signup and view all the answers

What is a crucial component of the circular economy that involves responsible disposability?

Recycling and materials reuse Signup and view all the answers

What is an important consideration during System Architecture Definition and Design Definition to enable reuse, remanufacturing, or recycling of materials?

Design for disassembly Signup and view all the answers

Which method assesses a product's environmental impact throughout its life cycle using sophisticated software support?

Life cycle assessment (LCA) Signup and view all the answers

What approach reduces the likelihood of harm to people, assets, and the environment by addressing risks throughout a system's life cycle?

System safety engineering Signup and view all the answers

Which type of hazard arises from the interactions between the system, operators, and environment?

Socio-technical hazards Signup and view all the answers

What is a potential risk of using bull-bars in vehicles?

Increased risk to pedestrians in vehicle to pedestrian collisions Signup and view all the answers

What caused the loss of two 737 Max aircraft due to failure to specify Maneuvering Characteristics Augmentation System (MCAS) as safety critical?

Failure to manage design changes Signup and view all the answers

What is crucial for recognizing safety-critical requirements in system safety engineering?

Maintaining traceability Signup and view all the answers

What is the goal of mitigating known hazards in system safety engineering?

Reducing the likelihood or severity of hazards Signup and view all the answers

Study Notes

Intrinsic hazards are caused by material or design factors of system elements
Functional hazards result from incorrect or unexpected system functions
Socio-technical hazards arise from interactions between system, operators, and environment
Car on icy road and inexperienced driver: accident hazard, mitigated by traction control, trained drivers, or not driving in icy conditions
Failure to specify Maneuvering Characteristics Augmentation System (MCAS) as safety critical led to loss of two 737 Max aircraft
Bull-bars reduce risk of injury in vehicle to vehicle or vehicle to large animal collisions but increase risks to pedestrians in vehicle to pedestrian collisions
Asbestos or flammable substances present inherent hazards
Failure to properly remove old wiring led to Clapham junction rail accident
Misaligned mental models between operators, maintainers, and designers: false alarms led to overriding without investigation, resulting in Smiler accident
Piper-Alpha oil platform accident caused by failure to properly manage design changes, poor maintenance management, and poor contingency planning
System safety engineering seeks to control hazards by understanding system environment, wider SoI, proposed system, and use
Life Cycle Analyses and Methods specify safety requirements for system
Maintaining traceability is crucial for recognizing safety-critical requirements
Analyzing potential safety hazards using multiple techniques
Mitigating/controlling known hazards by reducing likelihood or severity
Establishing a safety management system tailored to organization, industry, and application
Defining approach to developing safe systems, managing infrastructure, processes, and information, overseeing operations and maintenance, and ensuring effective safety culture
Regular measurement and communication of safety culture to reinforce safety behavior.

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Description

Test and expand your knowledge of system safety engineering, which involves engineering the system of interest, the wider socio-technical operational system, and the socio-technical or purely social management system. This quiz covers the impact of system usage, maintenance, and management on safety, as well as the critical importance of aligning mental models of different stakeholders.