Forecasting and the Social Sciences, Michael Dunlop Young, 1968 [Article by Trist in this publication is reused in Towards a Social Ecology]
p.63 What makes choice unavoidable is what we might clumsily call a design principle. In designing an adaptive self-regulating system, one has to have built-in redundancy or else settle for a system with a fixed repertoire of responses that is adaptive only to a finite, strictly identified set of environmental conditions.
