According to the hybrid project management approach, which combines elements of waterfall and agile methodologies, the project manager should facilitate the collaboration and communication among the team members and adjust the scope and schedule as needed12. However, any changes to the product scope should be controlled and evaluated for their impact on the project objectives, risks, quality, and customer satisfaction34. Therefore, the best option for the project manager in this scenario is to follow the proper change control process and evaluate the change for further impact. This way, the project manager can ensure that the change is justified, approved, documented, and communicated to all relevant stakeholders5. The project manager can also assess the potential risks and benefits of the additional feature and take appropriate actions to mitigate or exploit them6.

The other options are not the best ways to avoid this situation in the future. Managing the scope baseline to influence the factors that drive change is a proactive approach to prevent unnecessary or excessive changes, but it does not address the change that has already occurred7. Working with the customer to ensure the feature adds value is a good practice to align the product with the customer needs, but it does not consider the impact of the change on the project constraints or other stakeholders8. Performing frequent reviews with the customer to ensure that the product is working as expected is a useful technique to gather feedback and validate the product quality, but it does not prevent the introduction of new features without proper change control. References: 1: What is the Hybrid Approach in Project Management? | Hygger.io 2: Hybrid Project Management: What is it, Approach & Software - Teamhood 3: [Project Scope Management | Project Management Institute] 4: [A Guide to the Project Management Body of Knowledge (PMBOK® Guide) – Sixth Edition], p. 131-132 5: [Change Control Process: A Complete Guide - ProjectManager.com] 6: [Project Risk Management | Project Management Institute] 7: [Project Scope Management | Project Management Institute] 8: [Project Stakeholder Management | Project Management Institute] : [Project Quality Management | Project Management Institute] : Project Scope Management | Project Management Institute : A Guide to the Project Management Body of Knowledge (PMBOK® Guide) – Sixth Edition : Change Control Process: A Complete Guide - ProjectManager.com : Project Risk Management | Project Management Institute : Project Stakeholder Management | Project Management Institute : Project Quality Management | Project Management Institute