This document discusses usability testing and provides various statistics and examples. It contrasts formal usability testing methods with guerilla testing methods. Formal methods involve structured tests with many participants, while guerilla methods use informal, low-cost tests with few participants to rapidly iterate a design. The document provides examples of companies that used different testing approaches and the outcomes.

1. Web
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6. Fairlady Z
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16. !
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23. ISO9241−11
Effectiveness( )
Efficiency
Satisfaction
Context of use
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24. Jakob Nielsen
http://www.usability.gr.jp/whatis/whatis001127-1.html
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29. 10% 83
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30. 1%→4%
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33. Formal
vs
Guerilla
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34. Formal
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35. delicious
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37. Guerilla
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38. WDE
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40. RITE
Rapid Iterative Testing and Evaluation
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41. Halo3
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42. 600 3000
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43. 300
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48. http://silverbackapp.com/
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