World is changing at a fast pace. The efficient supervisors ought to keep up with it. Do not just blindly follow the age old norms and rules. Think out of the box if required. Adjust to the needs of the organization.
Be hands on – Do not just always delegate. At times the boss should take on projects too. She may try picking up something less attractive or uninteresting and complete it wonderfully. This sets an example to all the team about taking up challenges and about how any work is important.