Begin with product intent
Development starts by defining the medical purpose, intended users, patient population, use environment, indications, limitations and operating principle. If these foundations remain ambiguous, requirements, risk analysis and validation will all inherit the ambiguity.
- Define the intended purpose before selecting detailed solutions.
- Separate clinical and user value from implementation assumptions.
- Record important exclusions and boundaries as deliberately as included functions.
Translate intent into controlled inputs
User needs describe what people and the healthcare context require. Design inputs translate those needs, applicable standards, risk controls and interface constraints into requirements that can be implemented and verified.
- Requirements should be necessary, unambiguous and verifiable.
- Sources and rationale should remain traceable.
- Risk controls must become real design requirements, not isolated entries in a risk table.
Build evidence as the product develops
Verification and validation should not be deferred until the design appears complete. Plans, methods, acceptance criteria, environments and responsibilities need to mature alongside the architecture and requirements.
- Verification asks whether design outputs meet design inputs.
- Validation asks whether the resulting device meets user needs and intended use.
- Traceability connects intent, requirements, controls, implementation and evidence.
Control transfer and change
A design is not complete when a prototype works. Production specifications, supplier controls, acceptance methods, configuration baselines and change processes must make the approved product reproducible and maintainable.
Key takeaways
- Development controls should improve engineering decisions, not merely document them.
- Product intent, risk management and requirements must evolve as one connected system.
- Evidence is most credible when it is created naturally throughout the lifecycle.