Safety-Critical Requirements

Safety Critical Definitions

• Software Requirement: “Measurable software processing that is necessary.”
• Safety-Critical Software Requirement: “A necessary aspect within a system whose anomalous behavior could negatively impact safety.” 

Safety-Critical Systems - Basic Facts

• “Safety-critical” encompasses many domains: Industrial, Automotive, Aerospace, Nuclear, Medical, etc. 
• Software size and complexity are rapidly increasing
• Yesterday’s non-safety-critical is becoming tomorrow’s safety-critical due to IoT, integration/connectivity, etc. 
• Requirements are  needed to guide development, identify hazard detection/mitigation, and assess implementation.

Safety-Critical Requirements –Background

• Experts say majority of safety-critical failures stem from requirements. 
• Safety-critical requirements include Safety aspects, but not exclusively: also address Functional, Performance, etc. 
• Most safety-critical requirements specifications are incomplete: lack complete hazard prevention/mitigation. 
• Need requirement identification, specification, verification, and management.

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