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HCI BASICS (Concerns in HCI (joint performance of tasks by humans and…

- - - - needs and preferences change
- - - - memorability
        
        how easy is it to reestablish proficiency after taking a time out
      - errors
        
        how many, how severe, how easy to recover from
      - efficiency
        
        how quickly can tasks be performed after learned
      - satisfaction
        
        how pleasant is the use
      - learnability
        
        how easy to accomplish first easy tasks
  - - - usability
      - utility
      - design
      - ...