"In the judgment of design engineers, the ordinary means of communicating with a computer are entirely inadequate. [...] Graphical communication in some form or other is of vital importance in engineering as that subject is now conducted; we must either provide the capability in our computer systems, or take on the impossible task of training up a future race of engineers conditioned to think in a different way."

Source : "Computers Then and Now". Journal of the ACM 15, Sect. 4, (pp. 1-7), January 1968.

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