Attributes identify Level IV surety.

• Reliance upon laws of nature and mathematics
• Principles-based design to approach physical impossibility of undesired consequences
• Continuous assessment to strive for absolute surety

  • to identify and respond to changes in the system or challenges to surety
  • to ensure design principles are maintained over the life of the system
  • to broaden understanding of performance of the system over the entire range of circumstances that may be present
  • to obtain utmost confidence and predictability in system surety

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