Several key team members recently left the project. Remaining members struggled to understand details and progress slowed, causing serious schedule delays. What should the project manager do?

The correct answer is to review the issues and adjust the project plan to provide a realistic schedule. This is the most proactive and responsible action. The project manager must first understand the full impact of the team member departures and the resulting knowledge gaps. Then, they should work with the remaining team to create a revised, achievable schedule. Requesting additional resources might be a later step, but without understanding the current situation, it's premature. Observing the team and allowing time is passive and risks further delays. Escalating to the sponsor without first analyzing the problem and proposing solutions is not ideal; the project manager should attempt to resolve issues at their level first.