Supplier issues are causing schedule delays, and some delayed tasks are on the critical path. What should the project manager do?

The project manager should review the critical path with stakeholders to define next steps because critical path delays directly impact the project end date. Involving stakeholders ensures they are aware of the impact and can contribute to or approve mitigation strategies, such as re-prioritizing tasks, adjusting resources, or negotiating with suppliers. Discussing critical path issues with only the purchasing department is insufficient as the problem affects the entire project schedule and requires broader input and buy-in. Reviewing the WBS with suppliers is not the most immediate or effective action for addressing critical path delays; the WBS defines scope, not necessarily the schedule impact or resolution. Escalating to the sponsor should be considered if other options fail or if the impact is severe and requires executive intervention, but the initial step should involve collaborative problem-solving with relevant stakeholders.