In a predictive project approach, milestones are crucial for monitoring progress and ensuring alignment with the project's defined scope and established deadlines. The project manager should first meet with the software team to discuss the feasibility of incorporating monthly milestone reviews as requested by the product leader.
This action aligns with the principles of effective communication and stakeholder engagement, which are essential in managing expectations and ensuring project success. By reviewing the possibility of monthly milestones, the project manager can facilitate a clear understanding of the project's progress and make necessary adjustments to meet the product leader's expectations and the project's objectives.
: = The importance of milestones in project management and the need for regular reviews to ensure project alignment with scope and deadlines are well-documented in the PMBOKGuide and PMP resources12. Additionally, the Professional in Business Analysis materials emphasize the significance of stakeholder communication and engagement in project success34.

When a key stakeholder requests additional work that is not in the scope, the first action a project manager should take is to evaluate the impact of the requested change. This involves assessing how the change will affect the project's scope, schedule, budget, quality, risk, and benefits. After a thorough evaluation, the project manager should submit a change request. This formalizes the process and ensures that the requested change is documented, evaluated, and approved (or rejected) systematically within the project's change control procedures.
: = The PMBOKGuide outlines the importance of evaluating the impact of scope changes and the process for submitting change requests. It emphasizes that changes should be formally documented and processed through the project's change control system12. This approach is aligned with best practices in project management for handling out-of-scope requests3.

The project manager should reinforce the value of documenting and approving all change requests and ask the customer to issue these through the agreed channels. This is because change requests are formal proposals to modify any aspect of the project and should follow the change management plan, which defines how changes will be monitored, controlled, and approved. The project manager should also communicate with the project team member and remind them of the change management process and their roles and responsibilities.
This will help prevent unauthorized changes that could impact the project scope, schedule, cost, quality, or risk. The project manager should also update the issue log and the lessons learned register to document the incident and the actions taken. References: (Professional in Business Analysis Reference Materials source and documents)
* PMBOK Guide, 6th edition, Section 4.6.1, "Perform Integrated Change Control: Inputs"
* PMBOK Guide, 6th edition, Section 4.6.3.1, "Perform Integrated Change Control: Outputs - Change Requests"
* PMBOK Guide, 6th edition, Section 4.6.3.2, "Perform Integrated Change Control: Outputs - Project Management Plan Updates"
* PMBOK Guide, 6th edition, Section 4.6.3.3, "Perform Integrated Change Control: Outputs - Project Documents Updates"
* PMI-PBA Guide, 1st edition, Section 6.3.1, "Trace Requirements: Inputs"
* PMI-PBA Guide, 1st edition, Section 6.3.2, "Trace Requirements: Tools and Techniques"
* PMI-PBA Guide, 1st edition, Section 6.3.3, "Trace Requirements: Outputs"

Stakeholder analysis is a type of project management analysis that helps project managers to identify and understand the needs, interests, expectations, and influence of the people who are affected by or can affect the project1. Stakeholder analysis can help project managers to communicate effectively with stakeholders, manage their expectations, and address any issues or concerns they may have2.
The other options are not relevant for the given information:
* Regression analysis is a statistical method that examines the relationship between one or more independent variables and a dependent variable3. It is often used to test hypotheses, estimate trends, or forecast outcomes4.
* Qualitative risk analysis is a process of prioritizing risks based on their probability and impact, as well as other factors such as urgency, stakeholder tolerance, or project objectives. It is often used to determine which risks require further analysis or response planning.
* Decision tree analysis is a graphical tool that shows the possible outcomes and consequences of a decision or a series of decisions. It is often used to compare alternatives, evaluate risks, or identify optimal choices.
1: Types of Project Management: Methodologies, Industries, and More 2: 12 Project Management Methodologies: Your Guide | Coursera 3: Project Management: What It Is, 3 Types, and Examples - Investopedia 4: Regression Analysis - Formulas, Explanation, Examples and Types : Qualitative Risk Analysis vs Quantitative Risk Analysis - PM Study Circle : Qualitative Risk Analysis - Project Management Knowledge : Decision Tree Analysis - Decision Skills from MindTools.com : Decision Tree Analysis - Project Management Knowledge

During a digital transformation, it's important for a company to update its performance measuring system to align with the new agile approach12. This involves shifting from traditional performance indicators like scope, cost, and schedule, to value-based measurements such as objectives and key results12. This approach allows for more flexibility and adaptability, which are key characteristics of agile methodologies12. It also encourages a focus on delivering value, rather than simply meeting predefined targets12. References: Toptal Guide, Third Stage Consulting