A key stakeholder proposes an additional requirement that may affect the schedule. Another stakeholder says it might be just a small task. What should the project manager do?

The project manager should request further clarification of the requirement. Before assessing impact or taking further action, it's crucial to fully understand the proposed change. This involves gathering details about its scope, objectives, and potential implications. Without clear understanding, any subsequent analysis (like risk analysis) would be based on assumptions and potentially inaccurate. Performing a qualitative risk analysis would be premature without a clear understanding of the requirement itself. Coordinating design document preparation is also premature; the requirement needs to be understood and potentially approved before design work begins. Managing stakeholder engagement is an ongoing process, but in this specific scenario, the immediate need is to clarify the proposed change.