According to the context Oliver is a first line manager, where his function is more of control and supervision than direction.
They are the ones whose function is to supervise the work of the lower levels and to communicate the inconveniences to the middle managers.
These types of managers are found after the operators or workers and lack the authority to make decisions that guide the business course.
Therefore, we can conclude that a first line manager is the one in charge of supervising the work of other people at a lower level, that is, they maintain and manage the work team.
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