On a complex project with several subcontractors, one subcontractor reports a likely schedule delay that could affect the others' ability to deliver on time. What should the project manager do first?

The project manager's first step should be to assess the schedule and update the risk register. This is because the reported delay is currently a potential issue, and its actual impact needs to be understood before taking further action. Assessing the schedule will help determine the magnitude of the delay and its ripple effects on other subcontractors and the overall project timeline. Updating the risk register formally documents this new risk, allowing for proper analysis, planning of responses, and monitoring. Informing other subcontractors prematurely could cause unnecessary panic or rework without a clear understanding of the situation. Modifying milestones and work sequences is a response to the delay, not the initial action, and should only be done after a thorough assessment. Escalating to senior management and stakeholders is also a later step, once the impact is quantified and potential solutions are explored.