"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."
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Arthur D. Hall
Arthur D. Hall (1925 – March 31, 2006) was an American electrical engineer and a pioneer in the field of systems engineering. He is known as father of the "picture telephone" an author of a widely used engineering 1962 textbook Methodology of Systems Engineering.
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