Present-State Safety Evidence: A Governance Principle for Safety-Critical Systems

This paper defines the concept of present-state safety evidence within safety-critical systems.
It identifies a structural governance gap between certified compliance and the operational condition of a system at the time it is actually relied upon.
Safety certification, inspection, and approval processes demonstrate that a system met specified requirements at the time of assessment. However, life-critical decisions are made at specific moments — when occupants, operators, or responders rely upon the system to function.
The paper therefore introduces the “moment of reliance” as a governance test:
At the point a system is depended upon for safety, what contemporaneous evidence could demonstrate that the system was safe to use at that time?
Where such evidence cannot be produced, safety is being inferred from historical compliance rather than demonstrated in the present.
This work does not propose a specific technical solution.
It instead establishes a governance principle: safety-critical systems must be capable of evidencing operational condition at the time of reliance, not only at the time of certification.
The principle applies across domains including building safety, fire protection, healthcare systems, industrial automation, transportation, and connected infrastructure.