Underperformance can have a negative impact on project success, resulting in missed deadlines, poor quality deliverables, and reduced team morale. Identifying underperforming team members is important for the success of the project, and this can be done by monitoring progress against objectives or conducting regular performance reviews. Common causes of underperformance include lack of skills or knowledge, poor communication, personal issues, and unclear expectations. Consequences of underperformance can include missed project goals, increased costs, and potential damage to the team's reputation. Addressing underperformance requires a proactive and supportive approach, which can include providing additional training and resources, clarifying expectations and goals, giving regular feedback, addressing personal issues, and setting consequences for continued underperformance. Timely and effective management of underperformance is crucial for the success of the project and the overall performance of the team.