What scoping hands over
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The product brief
A written statement of what the product does, who uses it, what the main flows are, and what is explicitly left out of the first release.
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Screen inventory
Every screen the first release will contain, with its purpose written in one sentence. Fewer screens than you expect at this stage, on purpose.
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Build sequence
The order sprints arrive in, and which of them produces a build you can actually install and test against.
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Out-of-scope list
Named explicitly, so a requirement that arrives in month three has something to be measured against rather than argued about.