Teamwork can increase safety, improve effectiveness, strengthen communication, boost morale, and make a police department more successful. A well-functioning team has synergy; the group members work together and off each other, improving each other's ideas and actions. A well-functioning team works interdependently; each officer is mutually dependent on the other to get the job done. Also, in a well-functioning team, the members support each other, both professionally and emotionally. Finally, in a well-functioning team, the team members share the same goals and values. First-line supervisors' behavior is the single most important factor in promoting teamwork among their officers. Supervisors should treat every officer equally and fairly, without regard to race, religion, gender, or friendship, and should show concern for everyone's personal welfare. The supervisor should deal severely with officers who disregard team standards, and should not allow officers to degrade each other. Finally, supervisors should structure work to enhance understanding and communication among officers.