Is Product backlog a replacement for traditional requirements document?
No. Scrum doesn’t prescribe the format of the Product Backlog, so a Scrum Team might consider using traditional requirements documents but this would likely lead to suboptimal results since the requirements are likely not described in terms of things that could be delivered within short timebox (Sprint) that could result in a Releasable Product Increment, as required by Scrum. Considering the Agile Manifesto, we might expect the Product Backlog to act as a reminder that detailed requirements will be clarified through face-to-face communication.
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