Final answer:
The statement is false; defining team membership is critical for effective teamwork, especially in large groups where social loafing and free riding can occur unnoticed.
Step-by-step explanation:
False, it is critical to define who is on the team even when there are many people involved in teamwork. Clear team definitions help ensure that roles and responsibilities are understood, which aids in preventing issues such as social loafing where some team members may not contribute as expected. Large groups face particular challenges as the larger the group, the harder it is to notice if someone is not contributing (free riding), adding complexity to large-scale team dynamics. Therefore, defining membership is essential for effective teamwork and the success of team objectives.