Attributed to George A. Kelly in Hinkle (1970, p. 91), as cited in: Fay Fransella and Robert A. Neimeyer. "George Alexander Kelly: The man and his theory." International handbook of personal construct psychology (2003): 21-31.
“It is clear that the building of models is not a purely mechanical process but requires skill of a high order – not merely mathematical skill but a sensitivity to the relative importance of different factors and a critical, almost an artistic, faculty in the selection of behaviour equations which are reasonable, tentative hypotheses in explaining the behaviour of actual economies.”
Source: 1950s, The Skills of the Economist, 1958, p. 16-17 as cited in Andrew Mearman (2011).
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Kenneth E. Boulding 163
British-American economist 1910–1993Related quotes
Source: The Role of Measurement in Economics. 1951, p. 14-15

Source: The structuring of organizations (1979), p. 3
Source: Systems Engineering Tools, (1965), p. 108; As cited in: Alberto Ortiz (1992) Systems engineering concept demonstration, process model http://www.dtic.mil/dtic/tr/fulltext/u2/a265469.pdf. p. 12
Source: Hidden Order - How Adaptation Builds Complexity (1995), Ch 4. Simulating Echo, p. 146
Context: Model building is the art of selecting those aspects of a process that are relevant to the question being asked. As with any art, this selection is guided by taste, elegance, and metaphor; it is a matter of induction, rather than deduction. High science depends on this art.
Philosophy : the basics (Fifth Edition, 2013), Introduction

"Do Animals Have Beliefs?" (1979); as quoted in The Case for Animal Rights by Tom Regan (University of California Press, 2004), p. 36 https://books.google.it/books?id=Y0tWjRmxFE4C&pg=PA36.

Source: Lateral Thinking : Creativity Step by Step (1970), p. 5; Preface