„Change the attitude toward errors. Think of an object's user as attempting to do a task, getting there by imperfect approximations. Don't think of the user as making errors; think of the actions as approximations of what is desired.“

—  Donald Norman, Ch. 5, p. 131.
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Donald Norman2
psicologo e ingegnere statunitense 1935
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„I think that it is a relatively good approximation to truth — which is much too complicated to allow anything but approximations — that mathematical ideas originate in empirics.“

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Context: I think that it is a relatively good approximation to truth — which is much too complicated to allow anything but approximations — that mathematical ideas originate in empirics. But, once they are conceived, the subject begins to live a peculiar life of its own and is … governed by almost entirely aesthetical motivations. In other words, at a great distance from its empirical source, or after much "abstract" inbreeding, a mathematical subject is in danger of degeneration. Whenever this stage is reached the only remedy seems to me to be the rejuvenating return to the source: the reinjection of more or less directly empirical ideas. "The Mathematician", in The Works of the Mind (1947) edited by R. B. Heywood, University of Chicago Press, Chicago

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„Unfortunately, nigh the whole world is now duped into thinking that silly fill-in forms on web pages is the way to do user interfaces.“

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„It is decidedly frightfully difficult to make something complete in all respects, and I think that there are scarcely any but those who content themselves with the approximate.“

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