Final answer:
According to PMI, the tenth project management knowledge area is Stakeholder Management, which involves identifying, analyzing, and managing project stakeholders to ensure effective communication and positive relationships.
Step-by-step explanation:
The tenth project management knowledge area, according to the Project Management Institute (PMI), is Stakeholder Management. This knowledge area focuses on the processes required to identify the people, groups, or organizations that could impact or be impacted by the project, to analyze stakeholder expectations and their impact on the project, and to develop appropriate management strategies for effectively engaging stakeholders in project decisions and execution. The goal is to ensure good communication and foster positive relationships to support project success.