Final answer:
A project management plan is used for guiding the project team, informing stakeholders, and integrating planning processes.
Step-by-step explanation:
A project management plan is used for all of the above. It serves as a roadmap for the project team members to guide them through project execution, a communication document for stakeholders to inform them about how the project will be performed and managed, and it integrates strategic and other planning processes into a consistent and coherent document.