HCI: evaluation

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Information about HCI: evaluation

Published on February 17, 2014

Author: erik.duval

Source: slideshare.net


Presented to my students on 17 February 2014.

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

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

Criteria for evaluation: what do you think?

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


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

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

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

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

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

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

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

User tracking • google analytics • “attention metadata”

Participants • representative • computer experience, language, task, motivation, education, etc. • gender, age • have to know they are not being evaluated • relationship • colleagues, friends, family, ...

they are ... human beings !

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

• 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

Factors that influence usability: what do you think?

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

Trash can in Thailand

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

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