According to the PMBOK® Guide, the primary purpose of Project Scope Management is to ensure that the project includes all the work required, and only the work required, to complete the project successfully.

Defining Boundaries: This knowledge area is primarily concerned with defining and controlling what is and is not included in the project. By establishing clear boundaries, the project manager prevents " Scope Creep, " which is the unauthorized expansion of the project scope without adjustments to time, cost, and resources.

Work Containment: It focuses on managing the project ' s perimeter. This involves the creation of a Project Scope Statement, the Work Breakdown Structure (WBS), and the WBS Dictionary, which collectively form the Scope Baseline.

Analysis of other options:

Option A: Determining and managing stakeholder needs is a part of the Collect Requirements process. While it is a process within Scope Management, it is not the overarching purpose of the entire knowledge area.

Option B: This likely contains a typo (intended to be " Controlling " ). While controlling the status and managing changes is part of the Control Scope process, it is a subset of the primary goal of defining the scope in the first place.

Option D: While the knowledge area does differentiate between product scope (features/functions) and project scope (work to be done), this differentiation is a requirement for successful management, not the primary purpose of the management itself.

Per PMI standards, effective Scope Management provides the foundation for schedule and cost estimates. If the project manager does not clearly define what is out of scope, the project risks failure due to uncontrolled growth and resource exhaustion.