A project manager is tasked with managing a customer relationship management (CRM) implementation project. The project charter is approved, and the project is now in the planning phase. The project manager meets with the stakeholders several times to gather the initial requirements. However, each time they meet, the stakeholders provide additional information that is different from what they provided earlier. The stakeholders are becoming frustrated, and the sponsor is now unresponsive.
What should the project manager have done to avoid this situation?