Only a modern systems approach promises to get the full complexity of the interacting phenomena - to see not only the causes acting on the phenomena under study, the possible consequences of the phenomena and the possible mutual interactions of some of these factors, but also to see the total emergent processes as a function of possible positive and/or negative feedbacks mediated by the selective decisions, or "choices," of the individuals and groups directly involved.

p. 79; As cited in Gregory A. Daneke (1999) Systemic choices: nonlinear dynamics and practical management. p. 82. - Sociology and modern systems theory (1967)