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System Safety's Role in Requirements Analysis Exploring Concurrent Systems Engineering & System Safety Engineering Activities in Early Program Development.

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Presentation on theme: "System Safety's Role in Requirements Analysis Exploring Concurrent Systems Engineering & System Safety Engineering Activities in Early Program Development."— Presentation transcript:

1 System Safety's Role in Requirements Analysis Exploring Concurrent Systems Engineering & System Safety Engineering Activities in Early Program Development

2 System Engineering mission: DODI (paraphrased) Translate an operational need into a configured system Integrate all technical disciplines in a coordinated effort that meets cost schedule and performance Ensure compatibility of interfaces Ensure design meets requirements Measure and control technical risk

3 System Safety Mission: Mil-Std- 882 (paraphrased) Optimize safety, within cost and operational effectiveness, at a system level (System Safety Program) Influence the translation of operational needs into a configured system with appropriate safety characteristics (PHL, Safety Design Guidelines, PHA, SSHA, OSHA, etc) Influence all technical disciplines in a coordinated effort to ensure that safe design practices are uniformly applied and identified hazards are controlled (Safety Design Guidelines, Hazard Mitigation and Tracking) Ensure compatibility of interfaces where interfaces effect the safety of the system (PHL, PHA, SSHA, OSHA, etc) Ensure design meets requirements where requirements are safety driven (V&V of Safety Design Guidelines, Hazard Mitigation and Tracking) Measure and control safety risk (see above)

4 Mission Needs Statement Operational Concept Mission Analysis System Concept Key System Requirements Perform Segment/ Subsystem Trades Select Baseline Configuration Prepare System Spec Sizing/ Sensitivity Analysis Define Variable System Configuration (s) System Trades Requirements Flow Down To Segments Verify Capability Establish Cost & Risk Parallel Missions... Parallel Timelines... Mission Needs Statement Operational Concept Mission Analysis System Concept Key System Requirements Perform Segment/ Subsystem Trades Select Baseline Configuration Prepare System Spec Sizing/ Sensitivity Analysis Define Variable System Configuration (s) System Trades Requirements Flow Down To Segments Verify Capability Establish Cost & Risk Concept Trade Safety Considerations Regulatory Requirements Identification System Level Safety Req Development System Level Design Guidelnes Development Preliminary Hazards Lists System Safety Requirements Flowdown Preliminary Hazards Analysis System Level Requirements Analysis

5 Understanding Unifies Process Explore the integration of parallel activities into concurrent activitiesExplore the integration of parallel activities into concurrent activities Minimize over the wall activitiesMinimize over the wall activities Involve System Safety in Systems ProcessesInvolve System Safety in Systems Processes Involve Systems Engineering in System Safety ProcessesInvolve Systems Engineering in System Safety Processes

6 Good Requirements Singular in scopeSingular in scope ShallShall State specific need or objectiveState specific need or objective Be verifiable or measurableBe verifiable or measurable Sample Safety Requirements:... shall conduct a preliminary systems safety and hazards analysis and prepare a preliminary systems safety hazard list....Design shall comply with OSHA... System Safety Requirements are notoriously are notoriously poorly developed and rarely relate to the product

7 Early System Safety Involvement is crucial System Safety Engineers Are valuable assets to early development and are underutilized in this phase Early involvement of system safety engineers is crucial to:Early involvement of system safety engineers is crucial to: –Improving Trade Off studies and analyses –Reducing poorly defined safety requirements –Properly evolving general and regulatory requirements to good workable requirements –Properly allocating safety requirements for flow down –improving safety design guidelines

8 Working together works better As system engineers understand more about system safety and system safety engineers understand more about system engineering the over the wall evolves into concurrent engineering.As system engineers understand more about system safety and system safety engineers understand more about system engineering the over the wall evolves into concurrent engineering.

9 Better understanding through participation Personal, professional and organizational involvement to improve work productsPersonal, professional and organizational involvement to improve work products Chapter cross training/ joint meetingsChapter cross training/ joint meetings Personal networkingPersonal networking Enjoy!


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