The Product Backlog and Sprint Backlog serve different planning purposes in Scrum. The Product Backlog represents work that may be needed to improve the product. The Sprint Backlog represents the Developers’ plan for the current Sprint.
What is the Product Backlog?
The Scrum Guide describes the Product Backlog as an emergent, ordered list of what is needed to improve the product.
It evolves as requirements, priorities, technical knowledge and customer needs change. Items expected to be addressed sooner normally receive more refinement than work that may not be executed for months.
What is the Sprint Backlog?
The Sprint Backlog contains the Sprint Goal, Product Backlog items selected for the Sprint and the Developers’ actionable plan for delivering the Increment.
It changes during the Sprint as more is learned about the work required to achieve the Sprint Goal.
The primary planning difference
The Product Backlog answers a longer-range question: what work may provide value to the product?
The Sprint Backlog answers a near-term execution question: what are we doing now, why are we doing it and how do we intend to accomplish it?
Backlogs are not automatically schedules
A backlog may contain priorities, estimates and dependencies, but it is not necessarily a logic-driven Critical Path Method schedule.
Exporting backlog entries into scheduling software does not automatically create a valid Integrated Master Schedule. A program schedule requires meaningful logic, interfaces, milestones and visibility into cross-organizational dependencies.
Connecting backlog work to program milestones
At program level, planners can map groups of backlog items to releases, capabilities and integration events. This preserves traceability while preventing story-level detail from overwhelming the IMS.
Backlog items are commonly written as user stories. Continue with What Is a User Story?.