In which stage are facility managers trained to operate equipment within the completed project?

The correct answer is the stage of Commissioning. This phase is essential for ensuring that all systems and equipment in a completed project are functioning as intended. During commissioning, facility managers receive training on how to operate and maintain the installed systems and equipment. This training is critical as it prepares the management team to effectively oversee the building's operations, ensuring it runs efficiently and adheres to the design specifications.

In contrast, the pre-construction stage focuses more on planning and preparation before actual construction begins, while the close-out phase involves finalizing all project details, documentation, and ensuring that everything is complete, but does not generally include specialized training for operating equipment. The design development stage is primarily concerned with refining the project plans and specifications, rather than hands-on operational training regarding the completed facilities.