A project stakeholder is requesting changes to the project plan.

According to the PMBOK® Guide, the handling of change requests is a core function of the Monitoring and Controlling Process Group. Specifically, this is managed through the Perform Integrated Change Control process.

The Mechanism: While changes can be identified in any process group, they must be formally addressed, reviewed, and approved or rejected within Monitoring and Controlling. This ensures that the impact of the change on the project ' s scope, schedule, cost, and quality is fully understood before the project plan is updated.

Integrated Change Control: This process is responsible for reviewing all change requests, approving changes, and managing changes to deliverables, organizational process assets, project documents, and the project management plan.

The Flow:

A stakeholder requests a change.

The change is documented in a change request.

The project manager assesses the impact.

The Change Control Board (CCB) or project manager approves/rejects the change.

If approved, the project manager updates the project plan and baselines (which happens in the Planning group, but the addressing and governance of the request itself is a Monitoring and Controlling activity).

Analysis of Other Options:

A. Initiating Process Group: This group is used to define a new project or a new phase of an existing project by obtaining authorization. It is too early for formal changes to a detailed project plan.

B. Planning Process Group: While this group is where the project plan is created or updated after a change is approved, the actual process of addressing, analyzing, and deciding on a change request belongs to Monitoring and Controlling.

C. Executing Process Group: This group consists of those processes performed to complete the work defined in the project management plan. While execution may trigger the need for a change, it does not provide the framework for addressing or approving it.