The person and the machine exert a close control over each other within
the system. The point of control occurs at the interface, which is most often
a control and display panel of some sort. The machine should be capable
of carrying out functions automatically once the human has activated it. If
not, then we have a tool rather than a machine. Although Meister (1977)
conceptualized the PMS as only containing those elements or people that
have direct control over the machines, ergonomic science in later years
recognized less direct sources of system control that do in fact aect the
interactions at the ...
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