A team has been working for two months and has consistently missed planned user stories. How should the project manager address this issue?

In a functional organization, a product analyst is assigned to a short-duration application development effort. The analyst expresses concerns about the task and asks the project manager to provide the support of a peer with expertise in this domain.
What should the project manager do?

A project manager finds that there are knowledge gaps in the project team relating to the core competencies required to deliver the desired results. What should the project manager do to achieve the desired results?

The change control board (CCB) has approved a change request to add a new component within a product. The operations manager discovers the change after its approval and complains that the implementation of the change will cause significant disruption to the production line.
What should the project manager do first?

During the course of the project, several obstacles are identified that are preventing the project from moving forward.
What should the project manager do to remove the obstacles?