Perception threshold
Impact tracedCurrent evidenceSite 04 Review before deployment
Physical AI
Evolves continuously.
Software · Models · Hardware · Environment
Engineering understanding
Manually reconstructed.
At points in time · Reviews · Audits · Documents · Snapshots
The robot changes continuously. Its assurance basis should too.
Ply learns what it is reasoning about.
Ply extracts product and environment facts from engineering artifacts, determines what controls downstream assurance conclusions, and asks only when something important cannot be established.
✓Autonomous operationEstablished
✓Protective stopEstablished
✓Worker detectionEstablished
?Human access to operating areaUnknown
Ply found
1 decision needed to continue
Why this matters
Controls the worker-interaction safety path.
Standards become engineering work.
Ply turns applicable safety and cybersecurity requirements into connected engineering work—requirements, controls, tests and evidence grounded in the actual hardware, software and operating environment.
01Engineering state
02System
03Safety & cybersecurity
04Standards & requirements
05Tests & verification
06Evidence
07Release
One system. One Assurance Graph.Every relationship carries its basis.
Ask Ply what the change means.
Ply does not answer from a generic chatbot. It reasons over the current engineering state, its Assurance Graph, and the evidence connected to it.
Need review3
Basis unchanged27
Verification to rerun1
See why →
Synthetic engineering example
One change · consequences everywhere
Understanding stays alive as the product changes.
ply propagates each engineering decision through the relationships, evidence and deployments that depend on it.
01End-effector replacedEngineering change
02Pinch-point hazard updatedConnected assurance state
03Force-limit assumption challengedReview required
04Force-limit test requiredTest to run
05Site 04 requires reviewSites 01–03 remain eligible
A change shouldn’t restart your entire safety case.
Ply isolates the requirements, tests and evidence that need attention while preserving the work whose controlling assumptions still hold.
Synthetic engineering example · Change impactPR #184 · perception threshold
0.72 → 0.64Needs attention
Worker detectionReview
Low-light validation suiteRerun
Site 04Hold
Basis preserved
Emergency stopBasis unchanged
Braking controllerBasis unchanged
Sites 01–03Evidence still applies
3 things to revisit. 27 whose basis hasn’t changed.
Every decision is inspectable.
Every conclusion has a basis.
Understanding is the substrate
Engineering understanding is the engine.
01Continuous assurance.
What still holds?
02Traceability and verification.
What must we prove?
03Release readiness.
Can we deploy?
From engineering state to deployment decisionOne connected basis for trust.
Engineering assurance for Physical AI
Safety by design.Compliance as a byproduct.
Operationalize safety, cybersecurity and standards directly in the engineering loop—and keep requirements, tests and evidence current as the system evolves.
Build with ply ↗