CAPM Practice: Demonstrate an understanding of the various project life cycles and processes

Lena Novotny is leading a software implementation at Firefly Data where requirements are unclear and stakeholder needs are expected to evolve. The team plans to deliver working software every two weeks and gather feedback to refine the product. Midway through the project, a senior executive demands a detailed plan showing all deliverables and exact completion dates for the next six months. What should Lena do?