20130219 chi evaluatie

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20130219 chi evaluatie

  1. 1. CHI: evaluatie#chikul13Leuven, 19 February 2012Erik Duvalhttp://erikduval.wordpress.com@ErikDuval 1
  2. 2. http://www.slideshare.net/erik.duval2
  3. 3. Criteria for evaluation: what do you think?• ... • ...
  4. 4. criteria• Usability • Learnability• Usefulness • Efficiency• Meaning • Memorability• (aesthetic) Qualities • Accuracy• Sociability • Satisfaction [Nielsen, 1993]
  5. 5. • formatief • tijdens het ontwikkelen • om te verbeteren• summatief • op het einde • om te bewijzen dat “het (niet) werkt”
  6. 6. http://semanticstudios.com/publications/semantics/000029.php
  7. 7. Criteria• Time • to learn the application • to perform task • that users remember how and what• Errors • number • kind• Subjective feeling of satisfaction Often a compromise - important to make explicit
  8. 8. methods- questionnaire- usability engineering- by experts- usage tracking
  9. 9. questionnaires http://hcibib.org/perlman/question.html
  10. 10. Fhttp://www.cc.gatech.edu/gvu/images/lab/usability-lab.jpg Usability Lab
  11. 11. Usability engineering•‘Think-aloud protocol‘ •Video recording with annotation •Log, remarks, etc. for analysis•‘Discount usability engineering’•Comparative test of user interface
  12. 12. By experts•in HCI or domain•very effective•delicate relation with developers•target •identify problems •suggest solutions•through checklist of guidelines
  13. 13. User tracking• “attention metadata”• google analytics
  14. 14. Participants• representative • computer experience, language, task, motivation, education, etc. • gender, age• have to know they are not being evaluated• relationship • colleagues, friends, family, ...
  15. 15. they are ... human beings
  16. 16. how many? Text http://www.useit.com/alertbox/20000319.html http://www.useit.com/alertbox/20000319.html
  17. 17. • every test user finds fraction L of usability issues• independent test users n users find fraction 1-(1-L)n• L=31% 85% for n=5, 99% for n=15 L=8% 35% for n=5
  18. 18. Factors that influence usability: what do you think?•... •...
  19. 19. Factoren: Cognitief•cognitive •fatigue, boredom, stress, fear, ...•personality •gender (‘abort’)•cultural •i18n
  20. 20. Trash can in Thailand
  21. 21. ?http://erikduval.wordpress.com/ @ErikDuval 22

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