While a small proportion of supervisors are employed on a casual basis, in order to be promoted
in the organization supervisors need to be employed on a full-time basis. Many of the supervisors
commence their tenure in the organization as staff members, although it is possible to complete a
supervisory traineeship without first working as a staff member. Supervisor pay rates are largely
determined as function of the position within the branch hierarchy, although some differences exist
between branches.