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
“We should not, perhaps, take it for granted that a description in terms of a formalised model, which has certain properties lacking in those derived from models of another kind, will necessarily be the best description for all of the very diverse purposes for which the descriptions of languages are needed. In assessing the value of a description, it is reasonable to ask whether it has proved useful for the purposes for which it was intended.”
Source: 1950s–1960s, The Linguistic Sciences and Language Teaching, 1964, p. 13. cited in: David Brazil (1995) A Grammar of Speech. p. 9.
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Michael Halliday 23
Australian linguist 1925–2018Related quotes

Bk I, Ch I
The Ethics Of Aristotle (Vol. I)

Albert Einstein: Philosopher-Scientist, Cambridge University Press, 1949, p. 672
"Einstein's Reply to Criticisms" (1949)
Source: Dealing with Complexity (1988), p. 111.

"The Methodology of Positive Economics" (1953)

Mind, Brain, and Humanist Values (1965)
Context: Any model or description that leaves out conscious forces... is bound to be sadly incomplete and unsatisfactory... This scheme is one that puts mind back over matter, in a sense, not under or outside or beside it. It is a scheme that idealizes ideas and ideals over physical and chemical interactions, nerve impulse traffic, and DNA. It is a brain model in which conscious mental psychic forces are recognized to be the crowning achievement of some five hundred million years or more of evolution.
Strawson (1964) "Identifying Reference and Truth-Values", Theoria Vol xxx; As cited in: Paul Snowdon (2009) " Peter Frederick Strawson http://plato.stanford.edu/archives/fall2009/entries/strawson/", The Stanford Encyclopedia of Philosophy.

Source: "A synopsis of linguistic theory 1930-1955." 1957, p. 21; as cited in: Olivares, Beatriz Enriqueta Quiroz. The interpersonal and experiential grammar of Chilean Spanish: Towards a principled Systemic-Functional description based on axial argumentation. Diss. University of Sydney, 2013.
Source: Executable Modeling with UML. A vision or a Nightmare (2002), p. 697