Cognitive Artifacts

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@incollection{norman1991-cognitiveartifacts,
Author = {Norman, Donald A.},
Booktitle = {Designing Interaction: Psychology at the Human-Computer Interface},
Editor = {Carroll, John M.},
Isbn = {0-521-40056-2},
Pages = {17--38},
Publisher = {Cambridge University Press, New York},
Series = {Cambridge Series On Human-Computer Interaction},
Title = {Cognitive Artifacts},
Url = {http://portal.acm.org/citation.cfm?id=120354},
Year = 1991}