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.
Ad hoc and select committees are established to study specific issues, problems or questions. Sometimes these temporary committees are formed within a single chamber, or they are formed as joint committees with members from both chambers. Of these temporary committees, conference committees tend to be the most important in affecting legislation.