In a lessons learned workshop, a stakeholder said the project failed to deliver the expected business value. What should the project manager do?

The project manager should review the business benefits realization plan with stakeholders because this plan specifically outlines how and when the project's intended benefits will be achieved and measured. If a stakeholder believes the project failed to deliver expected business value, it indicates a potential misalignment or misunderstanding regarding these benefits, their measurement, or their realization. Reviewing this plan directly addresses the core concern about value delivery. Reviewing tasks in the project management plan is too granular and focuses on outputs, not the ultimate value. Reviewing the budget addresses cost, not necessarily the value derived. Reviewing the communications management plan addresses how information is shared, not the substance of the business value itself.