Automation describes a wide range of technologies that reduce human
intervention in processes, mainly by predetermining decision criteria,
subprocess relationships, and related actions, as well as embodying those
predeterminations in machines. Automation has been achieved by various means
including mechanical, hydraulic, pneumatic, electrical, electronic devices,
and computers, usually in combination. Complicated systems, such as modern
factories, airplanes, and ships typically use combinations of all of these
techniques. The benefit of automation includes labor savings, reducing waste,
savings in electricity costs, savings in material costs, and improvements to
quality, accuracy, and precision.