A mechanical system consists of (i) a power source and actuators that generate forces and movement, (ii) a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement, and (iii) a controller with sensors that compares the output to a performance goal and then directs the actuator input.
Committee with a continued existence, formed to do its assigned work on an ongoing basis. Budget and finance committees generally are standing committees. See also ad hoc committee.
A special committee (or working, select, or ad hoc committee) is established to accomplish a particular task or to oversee a specific area in need of control or oversight. Many are research or coordination committees in type or purpose, and are temporary.