This feature is available in Enterprise and Ultimate editions.
The Member Tracking page displays a listing of all team members assigned to a specific sprint/iteration and a flat list of all backlog items, tasks, and tests owned by each member.
Tracking can also be done on each team member's My Home page, which provides a filtered view for each team member. As such, it is often preferred when individuals are doing their own entry.
Accessing Member Tracking
From the main menu, select Sprint Tracking > Member Tracking.