“We should continue to use simple models where they capture enough of the core underlying structure and incentives that they usefully predict outcomes. When the world we are trying to explain and improve, however, is not well described by a simple model, we must continue to improve our frameworks and theories so as to be able to understand complexity and not simply reject it.”

— Elinor Ostrom

Elinor Ostrom (2009) "Nobel Prize Lecture", December 8.

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Elinor Ostrom4

American political economist 1933–2012

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“General Systems Theory, as originally intended by Von Bertalanffy, is an ideal framework for the modeling of a business enterprise. Work, in its most civilized form should enrich, empower and emancipate. Thus we must continue to find ways to support work as a humanistic, not mechanistic endeavor. We must continue to seek out new models of business that support and enhance the individual as well as the collective whole. Given all this new technology, we need new institutions for handling it.”

Anthony Stafford Beer (1926–2002) British theorist, consultant, and professor

Beer (1974) Designing Freedom. House Of Anansi Press, Toronto cited in: B. Dawson (2007) "Bertalanffy Revisited: Operationalizing A General Systems Theory Based Business Model Through General Systems Thinking, Modeling, And Practice", In: Proceedings of the 51st Annual Meeting of the ISSS, 2007.

“If our brains were simple enough for us to understand them, we'd be so simple that we couldn't.”

Ian Stewart (1945) British mathematician and science fiction author

Source: The Collapse of Chaos: Discovering Simplicity in a Complex World

“The problem is not the math itself, but the blind acceptance and even idolatry we have applied to the quantitative models. These predictive models leave citizens befuddled and unable to defend or criticize model-based decisions. We argue that we should accept the fact that we live in a qualitative world when it comes to natural processes. We must rely on qualitative models that predict only direction, trends, or magnitudes of natural phenomena, and accept the possibility of being imprecise or wrong to some degree. We should demand that when models are used, the assumptions and model simplifications are clearly stated. A better method in many cases will be adaptive management, where a flexible approach is used, where we admit there are uncertainties down the road and we watch and adapt as nature rolls on.”

Orrin H. Pilkey (1934) American ecologist

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“Haavelmo was the ﬁrst to recognize the capacity of economic models to guide policies. This paper describes some of the barriers that Haavelmo’s ideas have had (and still have) to overcome, and lays out a logical framework that has evolved from Haavelmo’s insight and matured into a coherent and comprehensive account of the relationships between theory, data and policy questions. The mathematical tools that emerge from this framework now enable investigators to answer complex policy and counterfactual questions using simple routines, some by mere inspection of the model’s structure.”

Judea Pearl (1936) Computer scientist

Judea Pearl, "Trygve Haavelmo and the emergence of causal calculus." University of California Los Angeles, Computer Science Department, CA. 2012.

“To be simple is to accept the essence of the message and not try to twist it or adapt it to our own ideas. To be simple we must desire to remain in the image of God. We must not be so complex that we make God into our image! Simplicity is dying to self, an emptying.”

Catherine Doherty (1896–1985) Religious order founder; Servant of God

"For This I Have Laid Down My Life", p. 12
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“There is no over-arching theory of complexity that allows us to ignore the contingent aspects of complex systems. If something really is complex, it cannot by adequately described by means of a simple theory. Engaging with complexity entails engaging with specific complex systems. Despite this we can, at a very basic level, make general remarks concerning the conditions for complex behaviour and the dynamics of complex systems. Furthermore, I suggest that complex systems can be modelled.”

Paul Cilliers (1956–2011) South African philosopher

Source: Complexity and Postmodernism (1998), p. ix

“If we study the history of science we see happen two inverse phenomena… Sometimes simplicity hides under complex appearances; sometimes it is the simplicity which is apparent, and which disguises extremely complicated realities.
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Henri Poincaré book Science and Hypothesis

Science and Hypothesis (1901)

“The equilibrium… in order to become static—should be steady, permanent, lasting. …This type of equilibrium… is… independent of any scale. A reduced model will show the same effects as the proper structure. Experiments on models are simple and… instrumental for understanding such structural problems.”

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“If we are to use effectively these abstract models and this descriptive material, we must have a comparable exploration of the criteria for determining what abstract model it is best to use for particular kinds of problems, what entities in the abstract model are to be identified with what observable entities, and what features of the problem or of the circumstances have the greatest effect on the accuracy of the predictions yielded by a particular model or theory.”

Milton Friedman (1912–2006) American economist, statistician, and writer

"The Methodology of Positive Economics" (1953)

“There's no simple formula here. But we must try as best we can to balance isolation and engagement, pressure and incentives, so that human rights and dignity are advanced over time.”

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2009, Nobel Prize acceptance speech (December 2009)

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