Presented to my students on 17 February 2014.

1. HCI: evaluatie
KU Leuven, B, 17 February 2014
!
Erik Duval
http://erikduval.wordpress.com
@ErikDuval
1

2. 2
http://www.slideshare.net/erik.duval

3. Criteria for evaluation:
what do you think?

4. criteria
•
Usefulness
•
Meaning
•
(aesthetic) Qualities
•
Sociability
•
Usability

5. http://semanticstudios.com/publications/semantics/000029.php

6. Usability
• Learnability: time to learn the application
• Efficiency: time to perform task
• Memorability: timethat users remember how and what
• Accuracy: number and kind of errors
• satisfaction: subjective feeling
Often a compromise - important to make explicit

7. •
tijdens het ontwikkelen
•
om te verbeteren
•
summatief
•
op het einde
•
om te bewijzen dat “het (niet) werkt”
•
formatief

8. methods
!
- questionnaire
- usability engineering
- by experts
- usage tracking

9. questionnaires
http://hcibib.org/perlman/question.html

10. http://www.cc.gatech.edu/gvu/images/lab/usability-lab.jpg
Usability Lab

11. Usability engineering
• ‘Think-aloud protocol‘
• Video recording with annotation
• Log, remarks, etc. for analysis
• ‘Discount usability engineering’
• Comparative test of user interface

12. By experts
•
•
•
•
in HCI or domain
very effective
delicate relation with developers
target
• identify problems
• suggest solutions
• through checklist of guidelines

13. User tracking
•
google analytics
•
“attention metadata”

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. they are ... human beings
!

17. how many?
Text
http://www.useit.com/alertbox/20000319.html
http://www.useit.com/alertbox/20000319.html

18. • every test user finds fraction L of usability
issues
• independent test users
n
n users find fraction 1-(1-L)
• L=31%
L=8%
85% for n=5, 99% for n=15
35% for n=5

19. Factors that influence usability:
what do you think?

20. Factoren: Cognitief
• cognitive
• fatigue, boredom, stress, fear, ...
• personality
• gender (‘abort’)
• cultural
• i18n

21. Trash can in Thailand

22. ?
@ErikDuval
http://erikduval.wordpress.com
22