A team member inexperienced in system development is underperforming and no qualified replacements are available. What should the project manager do?

The project manager's primary responsibility is to facilitate project success. When a team member is underperforming due to inexperience and no replacements are available, the most proactive and beneficial approach is to invest in their development. Assessing their needs and providing training directly addresses the root cause of the underperformance, builds team capability, and aligns with the project manager's role in developing the project team. Hiring a new resource (even with budget reserve) or requesting a substitute is not feasible given the constraint that no qualified replacements are available. Offering an incentive without addressing the skill gap is unlikely to resolve the underlying performance issue.