In a 1981 article entitled "The truth about Unix: The user interface is horrid "  published in Datamation , Don Norman criticized the design philosophy of Unix for its lack of concern for the user interface. Writing from his background in cognitive science and from the perspective of the then-current philosophy of cognitive engineering ,  , he focused on how end users comprehend and form a personal cognitive model of systems--or, in the case of Unix, fail to understand, with the result that disastrous mistakes (such as losing an hour's worth of work) are all too easy.
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