Unit size refers to the number of positions (or unit) contained in a single unit. The equivalent term “span of control” Is not used here because sometimes unit are kept small despite an absence of close supervisory control. For example when experts coordinate extensively by mutual adjustment as in an engineering learn in a space agency, they will torn into small learns, in this case, unit size is small and span of control is low despite a relative absence of direct supervision . in contrast, when work is highly standardize (because of either for malization or training t size can be very large because there is little need for direct supervision . One foreman can supervise dozens of assemblers because they work according to very light instructions.