CONTROL SYSTEM (Characteristics of a)
Charles François (2004). CONTROL SYSTEM (Characteristics of a), International Encyclopedia of Systems and Cybernetics, 2(1): 698.
| Collection | International Encyclopedia of Systems and Cybernetics |
|---|---|
| Year | 2004 |
| Vol. (num.) | 2(1) |
| ID | ◀ 698 ▶ |
| Object type | Methodology or model |
According to O. JOHANSEN BERTOGLIO (1985, p.144-45) any control system needs the following characteristics:
- a negative feedback
- a fixed point of reference within a limited vicinity, wherein the variable must be kept
- a repertory of states which allows it to give an efficient response to any normal and specific stimulus
This last point is thus stated by G. PASK: “The amount of control (measured as a variety) depends upon the amount of information the controller gleans from the environment” (1961, p.53). This is equivalent to ASHBY's Law of requisite variety.