When should the Contractor generally assign additional personnel to manage delays?

The selection of assigning additional personnel to manage delays when the Contractor is solely responsible for the delays is the most appropriate response. This choice emphasizes accountability and the Contractor's obligation to rectify issues that arise under their control. When delays originate from the Contractor's actions, it is their responsibility to allocate more resources or expertise to address and mitigate these setbacks. Doing so demonstrates a commitment to maintaining project timelines and meeting contractual obligations.

In contrast, the other scenarios may not necessarily warrant an immediate response from the Contractor. External factors may be beyond the Contractor's control, suggesting that they might not be required to add personnel since the delays could be unavoidable. For requests by the City, while it may indicate a need for support, it does not specifically pertain to the Contractor's internal responsibility for managing their own delays. Lastly, addressing delays only at the start of the project is inadequate, as it overlooks the potential for ongoing management of unforeseen issues as the project develops.