John Gall, Systemantics:  How Systems Work and Especially How they Fail
New York, Quadrangle Books, 1975
Page 71

Consider, for example, the System of the Family. The family has been around for a long time.... Clearly, this is a functioning family system. Its immense survival power is obvious. It has endured vicissitudes compared to which the stresses our own day puts on it are trivial. And what are the sources of its strength? They are extreme simplicity in structure; looseness in everyday functioning; “inefficiency” in the efficiency expert’s sense of the term; and a strong alignment with basic primate motivations.