A project sponsor would like to include a new deliverable. The sponsor contacts the project manager in order to seek advice on the most efficient approach to complete the deliverable within the next 2

While a cost-benefit analysis is valuable for new initiatives, the sponsor is asking for an approach to complete the deliverable, implying its desirability is already established, making the PM's role to advise on execution.

It is a core responsibility of the project manager to advise on scope management, resource allocation, and efficient approaches to meet project objectives, including new deliverable requests from the sponsor.

The management reserve is a contingency fund held for unknown-unknown risks or unplanned scope changes, and its utilization is typically approved by the sponsor or senior management. Using the management reserve can provide the necessary resources to expedite the new deliverable within the requested timeframe without negatively impacting the existing project budget or schedule baselines.

Changing the entire project methodology for a single new deliverable is a drastic and inefficient measure that would likely cause significant disruption and additional risk to the project rather than simply expediting one item.