"Katz and Kahn's (1966) The Social Psychology of Organizations has been the most influential. It remains one of the most widely read texts on organizational behaviour. Katz and Kahn develop a perspective in which the systems metaphor is used to mediate approaches as diverse as Marxism, human relations and event-structure theory.... In the synthesizing of structural-functionalism with the principles of general systems theory, Katz and Kahn develop a process model for interpreting organizational actions in terms of input, throughput and output. Their thesis revolves around the notion that formal social systems are homoeos- tatic, possessing qualities of negative entropy, feedback, differentiation and equifinality."