Design principles for cognitive artifacts

@article{cognitiveartifacts-red4,
Author = {Norman, Donald A.},
Doi = {10.1007/BF02032391},
Issn = {0934-9839},
eissn = {1435-6066},
Journal = {Research in Engineering Design},
Month = mar,
Number = 1,
Pages = {43--50},
urlpdf = {http://www.springerlink.com/content/t964010t85892678/fulltext.pdf},
Publisher = {Springer},
Title = {Design principles for cognitive artifacts},
Url = {http://www.springerlink.com/content/t964010t85892678/},
Volume = 4,
Year = 1992}