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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
methods- questionnaire- usability engineering- by experts- usage tracking
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• “attention metadata”• google analytics
Participants• representative • computer experience, language, task, motivation, education, etc. • gender, age• have to know they are not being evaluated• relationship • colleagues, friends, family, ...