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Software Safety Lifecycle
Hazard Identification
Functional Hazard


Analysis (FHA)

Preliminary System Safety Analysis (PSSA)
System Safety Analysis
Safety Case


A defensible argument that software is acceptably safe

Safety Arguments
Product-Based Arguments


• Evidence-based

Analytically demonstrate how specific safety issues are tackled

• Emphasized (Preferred)

Process-Based Arguments


• Process-only

Merely confirm adherence to development processes

• Weaker Assurance

Certification Achieved

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