A project manager is assigned to a project where a vendor has been engaged to...

 When faced with a situation where a vendor is unable to deliver as promised, it is essential for the project manager to engage in communication with both the vendor and the project team to explore all possible solutions. This approach aligns with the PMBOK® Guide’s emphasis on communication as a key aspect of project management. The project manager should work collaboratively to address the issue, which may involve negotiating a new delivery schedule, modifying the project scope, or finding alternative ways to meet project objectives.