Final answer:
Developing a project management plan is the planning process within the Project Scope Management knowledge area.
Step-by-step explanation:
The planning process within the Project Scope Management knowledge area is developing a project management plan. This involves the creation of a comprehensive document that outlines how the project will be executed, monitored, and controlled. The project management plan includes various components such as scope statement, work breakdown structure (WBS), schedule, cost estimates, risk management plan, and quality plan.