During Cross-Team Refinement, the ordered Product Backlog (1 through 9) is mapped out sothe Nexus...

PBI 2 is the most concerning because it involves a cross-team dependency within the same Sprint, which can create challenges and risks for the integration and delivery of the product increment. According to the Online Nexus Guide1, dependencies should be minimized or eliminated as much as possible, and if they exist, they should be made transparent and resolved as early as possible. Cross-team dependencies within the same Sprint can cause delays, conflicts, rework, and waste, and reduce the quality and value of the product increment 234.

The other answers are not correct for the following reasons:

A. PBI 2, because it has the most dependencies. This answer is not accurate because PBI 2 does not have the most dependencies, but only one dependency with PBI 1 from Team Red. PBI 3 has the most dependencies, as it depends on PBI 1, PBI 2, and PBI 4. However, PBI 3 is not as concerning as PBI 2, because its dependencies are not within the same Sprint, but across different Sprints. This means that PBI 3 can be refined and planned in advance, and the teams can coordinate and communicate their work more effectively 5.

B. PBI 1, because it is on the top of the Product Backlog. This answer is not relevant because the position of PBI 1 on the Product Backlog does not indicate its level of concern, but its priority and value. The Product Backlog is ordered by the Product Owner based on various factors, such as business value, risk, complexity, and dependencies. PBI 1 may be on the top of the Product Backlog because it is the most valuable or urgent item, or because it is a prerequisite for other items, but it is not necessarily the most concerning item 6.

C. PBI 1, because it is the first piece of work with a dependency. This answer is not true because PBI 1 is not the first piece of work with a dependency, but the first piece of work that other items depend on. PBI 1 does not have any dependencies itself, but it creates dependencies for PBI 2, PBI 3, and PBI 5. Therefore, PBI 1 is not as concerning as PBI 2, because it does not depend on any other item, and it can be completed independently by Team Red 5.