The answer
Resolve the product behavior first with the responsible stakeholder, then revise the technical design. Letting competing documents stand encourages developers and AI assistants to implement different expectations.
How does a system-design document differ from a PRD?
What happens when the PRD and architecture disagree about a feature?
More FAQs in How does a system-design document differ from a PRD?
Usually the system design explains the database choice and its tradeoffs. A PRD may include a technology constraint when a customer, integration, or organization requires it.
Assign the requirement an identifier, then reference it beside the responsible components, data flows, and permissions. Reviewers can follow that chain to detect missing implementation decisions.
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