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Software Interfaces (interface between software and user (user interface),…

- - - - User familiarity
      - User in control
      - User Aesthetic
      - consistency
      - Minimal User memory
      - minimal suorise
      - recoverability
      - User guidance
      - User feedback
      - User Diversity
      - Confirmation of Destructive Request
    - - 4 abstract models have been proposed
        
        Design model
        Software Engineer's view
        
        2.User Model
        software engineer's view of user
        
        User's Model
        end user's view
        
        System Image
        implementor's view
      - Usability:
        a measure of the effectiveness of the UI and how well the UI meets requirements
        
        attributes to asses the usability
        
        Learnability
        
        Speed of Operation
        
        Robustness
        
        adaptability
        
        for testing purposes the metrics are
        
        Menus and input
        
        screen readability
        
        screen layouts
        
        display characteristics
        
        personalization
        
        Accesability
        
        aesthetics
        
        speed
      - accessibility
        how well the UI meets the requirements of users who are physically challenged
        
        special needs can refer to many other needs other than physically challenged users
        
        ethical
        
        legal
        
        bussiness
        
        ADA
        prohibits discrimination based on disability
    - - KLM (keystroke level model)
        to use KLM we use the set of time tables to derive the time for a task
      - GOMS
        (goals, Operators, methods, selections )