One of the main inputs required for a deliverable is missing due to a miscommunication between the vendor and project manager. Because of the missed deliverable, the critical path of the project is…

Starting an audit is an extreme measure and premature without a detailed analysis of the current specific issue and its root causes.

Reviewing lessons learned is valuable for process improvement but is not the immediate action to address an active critical path extension.

Before taking any corrective action or auditing, the project manager needs to thoroughly analyze the specific vendor issue, including the miscommunication and its impact on the critical path, to understand the root cause and inform appropriate next steps. This analysis is crucial for effective problem-solving.

Executing a contingency plan requires a clear understanding of the problem; a detailed analysis helps determine if a contingency exists and is appropriate.