With few exceptions, all machines are designed to be used by humans. Even robots must
be programmed by a human. Human factors engineering is the study of the humanmachine
interaction and is defined as an applied science that coordinates the design of
devices, systems, and physical working conditions with the capacities and requirements
of the worker. The machine designer must be aware of this subject and design devices to
"fit the man" rather than expect the man to adapt to fit the machine