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HCI - mod 1 (Usability) (Usability motivations (Life-critical systems (Air…

- - - - Daily Use
      - Necessary Use
      - Edge Case
    - - Inadequate functionality
        
        frustrate users - rejected!
      - Excessive functionality
        
        complexity makes implementation, maintenance and learning more difficult
  - - - real-time system
        
        stocks
    - - few errors
        
        user will not use your system
      - Users trust is fragile
    - - No long waits
  - - - across different application packages and software tools
        
        Windows
        
        Mac
        
        Linux
    - - common
        
        action sequences
        
        terms
        
        units
        
        colours
        
        UI features
    - - software can be applied to multiple platforms
    - - Use pre-existing or common industry standards
        
        aid learning
        
        avoid errors
- - - - How much did users like using various aspects of the interface?
        
        allow for
        
        user feedback via interviews
        
        free-form comments
        
        satisfaction scales
  - - - task-performance times may be reduced by use of macros or shortcut keys
    - - speed of performance may have to be sacrificed
    - - in order to know
        
        which factor to succeed in
        
        which factor to tradeoff
- - - - Measurements of human body
        
        No average user
        
        compromises to UI needs to be made
        
        multiple versions of a system must be created
      - Workspace design
        
        Important in ensuring high job satisfaction
        
        high performance
        
        low error rates
    - - differences in culture
        
        Internationalization
        
        more effective localization may produce strong advantage
        
        to promote effective designs
        
        companies should run usability studies with users from different
        
        countries
        
        culture
        
        language communities
    - - "Americans with Disabilities" Act
    - - Can't do as much
        
        Reduced
        
        Motor skills
        
        perception
        
        vision, hearing, touch, mobility
        
        speed
        
        memory
      - Larger
        
        fonts
        
        touch screens
      - Louder sounds
      - Clearer navigation paths
    - - Emphasize entertainment and education
      - Abilities change with age
      - Goals for children's software
        
        Educational acceleration
        
        Socialization with peers
        
        Improve
        
        self-image
        
        self-confidence
        
        Creativity
        
        art
        
        music