Rensis Likert quote: “All component parts of any system of management must be consistent with each of the other parts and reflect the system'…”

“The management system of an organization must have compatible component parts if it is to function effectively. This conclusion has a very important implication; experiments in organizations must involve internally consistent changes. The traditional atomistic research design is not appropriate for experiments involving organizational theory or management systems. Every aspect of a management system is related to every other part and interacts with it.
The results obtained by altering a single variable or procedure while keeping all others the same usually will yield quite different results from those obtained when that variable is changed along with simultaneous and compatible changes in all other aspects of the management system. The true influence of altering one aspect of the system cannot be determined by varying it and it alone… In experiments involving organizational theory and management systems, therefore, a systems approach must be used. The organic integrity of each system must be maintained while experimental variations are being made.”

Rensis Likert (1903–1981) American statistician

Source: The Human Organization, 1967, p. 123

“Fourteen basic and well-known managing processes make up the components from which a management system for any business can be fashioned.”

Marvin Bower (1903–2003) American business theorist

Source: The Will to Manage (1966), p. 26

“In our definition of system we noted that all systems have interrelationships between objects and between their attributes. If every part of the system is so related to every other part that any change in one aspect results in dynamic changes in all other parts of the total system, the system is said to behave as a whole or coherently. At the other extreme is a set of parts that are completely unrelated: that is, a change in each part depends only on that part alone. The variation in the set is the physical sum of the variations of the parts. Such behavior is called independent or physical summativity.”

Arthur D. Hall (1925–2006) American electrical engineer

Source: Definition of System, 1956, p. 23

“The basic managerial idea introduced by systems thinking, is that to manage a system effectively, you might focus on the interactions of the parts rather than their behavior taken separately.”

Russell L. Ackoff (1919–2009) Scientist

Russell L. Ackoff and Fred Emery (1972) On purposeful systems, cited in: Lloyd Dobyns, Clare Crawford-Mason (1994) Thinking about quality: progress, wisdom, and the Deming philosophy. p. 40.
1970s

“The basic managerial idea introduced by systems thinking, is that to manage a system effectively, you might focus on the interactions of the parts rather than their behavior taken separately.”

Fred Emery (1925–1997) Australian psychologist

Russell L. Ackoff and Fred Emery (1972) On purposeful systems, cited in: Lloyd Dobyns, Clare Crawford-Mason (1994) Thinking about quality: progress, wisdom, and the Deming philosophy. p. 40.

“In our definition of system we noted that all systems have interrelationships between objects and between their attributes. If every part of the system is so related to every other part that any change in one aspect results in dynamic changes in all other parts of the total system, the system is said to behave as a whole or coherently.”

Arthur D. Hall (1925–2006) American electrical engineer

At the other extreme is a set of parts that are completely unrelated: that is, a change in each part depends only on that part alone. The variation in the set is the physical sum of the variations of the parts. Such behavior is called independent or physical summativity.
Source: Definition of System, 1956, p. 23