Post-hoc testing
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Post-hoc testing
IST 331 - Olivier GeorgeonApril 22nd 2010
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• Human nature is not a machine to be built after a model - and set to do exactly the work prescribed to it - but a tree, which requires to grow and develop itself on all sides, according to the tendency of the inward forces which make it a living thing.
John Stuart Mill, On Liberty (1859)
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Evolutionist process
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Design Use
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Why post-hoc testing?
• Avoid recalls.• Identify target.• Identify need for formation or documentation.• Final setup.• Evaluate the design.• Because all people (including designers) make
mistakes (i.e. user-testing can be used as a type of proof-reading).
• Provide feedback for the next iteration.
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Methods
• Same method as preliminary studies– Questionnaires and Interviews– Observational studies• Verbal protocol• Visual protocol
– Use unsolicited comments
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Activity analysis tools
• Noldus– http://www.noldus.com
• Interact– http://www.mangold-
international.com/
• Abstract– http://liris.cnrs.fr/abstract/
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Example
Local
Youtube
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8Youtube
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[1][2][3][4][5][6][7][8][9][10][11]
4/3/1970 5/20/2007
1/10/1973
[1] Ulster Volunteer Force (UVF)[2] Ulster Freedom Fighters (UFF)[3] Protestant Extremists[4] Loyalist Volunteer Forces (LVF)[5] Red Hand Commandos
[1][2][3][4][5][6][7][8][9][10][11]
[7] Irish National Liberation Army (INLA)[8] Saor Eire (Irish Republican Group)[9] Official Irish Republican Army (OIRA)/[10] Irish People's Liberation Organization (IPLO)[11] Irish Republican Army (IRA)
[6] Unknown
Republic of Ireland
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Conclusion
• Interface design is an evolutionist process.• Post-hoc evaluation also matters.
• Lot of room for IST research.
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