Sunday, July 23, 2006

Jakob Nielson on Usability

Jakob Nielson defines five aspects of product usability:
  • Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?
  • Efficiency: Once users have learned the design, how quickly can they perform tasks?
  • Memorability: When users return to the design after a period of not using it, how easily can they reestablish proficiency?
  • Errors: How many errors do users make, how severe are these errors, and how easily can they recover from the errors?
  • Satisfaction: How pleasant is it to use the design?
Some of the attributes are subjective, but they are nonetheless measurable and testable.

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