A Team Member is defined by their commitment to the goal(s) of the Scrum Team. If a person is not personally committed, they are not part of the team. Commitment cannot be imposed. A person’s manager can’t force them to be part of the Scrum Team by telling them to be committed. If all the members of the team are committed to the Sprint goal, then they will all work in whatever way is necessary to accomplish that goal. This commitment willingness to do what it takes is a key factor in creating a high-performance team. If any individual is not committed to the Sprint goal, they aren’t really part of the Scrum Team. Having someone how is not committed but is constantly interacting with Scrum Team members, who is doing work that is properly owned by the team, and who participates in team meetings as if they were a member of the team is incredibly disruptive. This “false” participation can cause morale problems if not eventually fixed either by the person becoming committed or by the person leaving the team. Having people who are on the team in name only will prevent a team from reaching a high-performance state.