During project execution, a key stakeholder approaches the project manager and questions the business value...

Explain to the stakeholder that it is up to the project sponsor and the client to determine if the project still has the perceived business value.

Inform the stakeholder that the project will still proceed to completion because the project charter has already been approved.

Consult the remainder of the stakeholders and the sponsor to determine if they have the same concern.

Validate the business value with the stakeholder by ensuring each requirement is still aligned to the business and project objectives.