Specific differences are described by the generic scope of each supervisory and managerial level. Another way to look at it is that a manager is responsible for making significant decisions on what the unit does: its purpose, functions and role, and for making commitments and decisions that require the expenditure of significant unit resources. Managers have a significant, external focus (to the world outside the unit), whereas a supervisor has a more internal focused responsibility for implementing the manager’s decisions through the work of subordinate employees. Once a decision is made on what to do, supervisors have a significant role in deciding how to do it; how to achieve the objective established by the manager. Supervisors often perform the same kind of work that the subordinates do; managers do not do the daily work of the unit as a regular part of their work, they may do it more on an exception basis or in resolving the most difficult problems facing the unit.