In which phase does a project conclude when completed to the customers' satisfaction?

The conclusion of a project, particularly when it has been completed to the customers' satisfaction, occurs during the closing phase. This phase is critical as it encompasses several important activities, including finalizing all project work, obtaining acceptance from the customer, and formally closing the project. Ensuring that the project meets the agreed-upon requirements and that all stakeholders are satisfied with the outcome is central to this phase. It often involves delivering the project's final product, conducting a project review to capture lessons learned, and completing any necessary administrative tasks, such as releasing project resources and archival documentation. Thus, the emphasis on stakeholder satisfaction and formal project closure solidifies this phase as the correct answer for when a project is considered complete.