Fig. 8
Cybernetic hierarchy. all types, whether these be mechanical servomechanisms (e.g. a thermostatically controlled central-heating system), biological organisms or
SOCIAL SYSTEMS. The assumption is that all such systems regulate their relation to an external environment by the operation of
a . feedback loop, in which changes in the environment are communicated to the system in a manner which brings about a corresponding adjustment of the system to maintain a steady state, or other state appropriate to the effective functioning or survival of the system (see also
CYBERNETIC HIERARCHY). Cybernetics and cybernetic analogies were in vogue in the 1950s and 60s, but subsequently they have suffered from a reaction against functionalist thinking and
SCIENTISM in the social sciences. See also
SYSTEMS THEORY,
STRUCTURAL-FUNCTIONALISM.