Handling underperforming team members requires a proactive and empathetic approach. Start by understanding the reasons behind their underperformance, and have a candid conversation to address any issues or concerns. Provide clear feedback on their performance gaps and specific expectations for improvement. Offer support and resources to help them improve, and create a plan with specific goals and timelines. Regularly monitor their progress and provide ongoing feedback and coaching. If necessary, involve HR or higher management for further guidance or disciplinary action.