PMP Practice: Break Down Scope

Putri Wulandari is managing a regulatory compliance upgrade for Amber Raven Consulting, a pharmaceutical manufacturer. The project must implement new FDA data integrity standards across four manufacturing sites by a fixed regulatory deadline in 14 months. The scope includes validating 23 existing systems, upgrading hardware at two sites, and implementing standardized documentation procedures. Regulatory requirements are fully defined in published FDA guidance documents, and any scope changes require formal regulatory impact assessment and potentially amended submissions to the FDA. During project planning, a senior stakeholder suggests switching to an iterative delivery approach with two-week sprints to 'increase flexibility and team engagement.' The stakeholder argues this would allow the team to respond faster to emerging issues. Which approach would be most appropriate for obtaining stakeholder agreement on project scope?