In Agile/Scrum methodologies, as described in the Agile Practice Guide and the Scrum Guide, there is a critical distinction between getting a story " ready " to start and getting it " ready " for the customer (Done).
Why Choice D is correct:
The Definition of Done (DoD): This is a formal description of the state of the Increment when it meets the quality measures required for the product. It is a checklist of all the technical and quality criteria that a user story must meet before it can be considered complete (e.g., coded, unit tested, integrated, documented, and bug-free).
Customer Use: When a customer claims a story is " not ready for use " during a demo, it usually means a quality standard or a functional requirement was missed. The team reviews the DoD to see if they skipped a mandatory step (like security testing or user documentation) that would have caught the issue before the demo.
Transparency: The DoD ensures that everyone (the team and the stakeholders) has a shared understanding of what " complete " work means.
Analysis of other options:
A (Burndown chart): This is a trend tool that shows how much work is remaining in a sprint. It tracks progress over time but does not contain quality criteria or checklists for individual user stories.
B (Velocity chart): This tracks the amount of work (usually in story points) a team completes in each sprint. It is a capacity planning tool, not a quality or requirements checklist.
C (Definition of Ready - DoR): This is the checklist used to determine if a user story is well-defined enough to be taken into a sprint (e.g., it has clear acceptance criteria and dependencies are removed). Since the story in the question is already being demoed, it had already passed the DoR. The issue now is whether it was finished correctly, which is the role of the DoD.
Key Concept: The Project Management Institute (PMI) emphasizes that the Definition of Done is the primary tool for maintaining quality in an adaptive environment. If an increment is not " Ready for Customer Use, " it means it failed to meet the DoD, and therefore, cannot be considered part of the Increment or contribute to the team ' s Velocity for that sprint. Choice D is the governing document for this situation.