A product team using prototypes for a multiyear initiative finds that a few user stories are taking longer to deliver. What should the project manager do?

The correct answer is to determine the risks and identify a resolution during the retrospective meeting. In an agile environment, retrospectives are dedicated events for the team to inspect and adapt their processes, identifying what went well, what didn't, and how to improve. Taking longer to deliver user stories is a process issue and a potential risk that needs to be discussed and resolved collaboratively by the team. Informing stakeholders about the delay during project updates is a reactive communication, not a proactive solution to the underlying problem. Discovering gaps in the communications management plan is unlikely to be the root cause of user stories taking longer to deliver, though communication can always be improved. Determining cross-dependencies and planning a spike in the next sprint might be relevant if the delay was due to technical unknowns or complex integrations, but the primary issue here is the delivery time of existing stories, suggesting a process or estimation problem best addressed in a retrospective.