Final answer:
The tenth PMI project management knowledge area is Stakeholder Management, essential for considering all parties interested in the project and ensuring their input throughout the project lifecycle.
Step-by-step explanation:
The tenth project management knowledge area, according to the Project Management Institute (PMI), is Stakeholder Management. This 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. Good stakeholder management can lead to a higher likelihood of project success, as it ensures that all parties with an interest in the project are considered and their input is accounted for throughout the project lifecycle.