What should be updated if there are changes to the scope baseline?

• A. Human resources plan
• B. Cost baseline and schedule baseline
• C. Communication management plan
• D. Stakeholder engagement plan

Answer: (B)

When there are changes to the scope baseline, it is necessary to update the cost baseline and schedule baseline because these components are directly linked to the scope of the project. The scope baseline defines the project's deliverables and boundaries; therefore, any adjustments to what is included in the project scope will inherently affect both the budget and the timeline established for the project.

The cost baseline is essentially the approved version of the project budget, including all cost estimates and the budgeted amount necessary to complete the project. Changes in scope often mean that certain tasks will require more resources or time, which will subsequently affect the cost estimates. Similarly, the schedule baseline reflects the planned start and finish dates for project activities; if the scope changes, the duration of tasks may also need to be adjusted, thereby impacting the schedule.

In contrast, while updates to the human resources plan, communication management plan, or stakeholder engagement plan can also be necessary due to scope changes, they are not as directly correlated as the cost and schedule baselines. Those plans may be impacted by scope changes, but the primary need to re-establish accurate project parameters lies within the cost and schedule baselines. This is why updating these two baselines is essential for effective project monitoring and controlling.