Mechanical control systems (staplers, car windows) use parts for movement/force control. They include input, process, and output. Types of motion: linear, rotary, reciprocating, oscillating.

This paper presents a general model to assess the impact of data and process quality upon the outputs of multi-user information-decision systems. The data flow/data processing quality control model is ...

Wassily Leontief, Structure of the World Economy. Outline of a Simple Input-Output Formulation, The Swedish Journal of Economics, Vol. 76, No. 4 (Dec., 1974), pp. 387-401 ...