Usability

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Definition of usability

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Usability

  1. 1. Mater of Arts in Communication Design WEB DESIGN Usability
  2. 2. Usability: formal definition Usability WEB DESIGN NABA 2014 Roberto DADDA 2
  3. 3. Usability, definition The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use. (ISO 9241) Usability ISO 9241 Ergonomic requirements for office work with visual display terminals (VDTs). ISO 13407 Human-centred design processes for interactive systems. WEB DESIGN NABA 2014 Roberto DADDA 3
  4. 4. Usability: declination Usability WEB DESIGN NABA 2014 Roberto DADDA 4
  5. 5. Usability WEB DESIGN NABA 2014 Roberto DADDA 5
  6. 6. Learnability • How easy is it for users to accomplish basic tasks the first time they encounter the design? • How easy is to remember? Usability WEB DESIGN NABA 2014 Roberto DADDA 6
  7. 7. Efficiency • Once users have learned the design, how quickly can they perform tasks? Usability WEB DESIGN NABA 2014 Roberto DADDA 7
  8. 8. Memorability • When users return to the design after a period of not using it, how easily can they re establish proficiency? Usability WEB DESIGN NABA 2014 Roberto DADDA 8
  9. 9. Errors handling • How many errors do users make, how severe are these errors, and how easily can they recover from the errors? Usability WEB DESIGN NABA 2014 Roberto DADDA 9
  10. 10. Satisfaction • How pleasant is it to use the design? Usability WEB DESIGN NABA 2014 Roberto DADDA 10
  11. 11. Not a surface matter Usability WEB DESIGN NABA 2014 Roberto DADDA 11
  12. 12. Roberto Dadda www.dadda.it roberto@dadda.it +39 338 775 22 03 Twitter, facebook, linkedin: robertodadda Usability WEB DESIGN NABA 2014 Roberto DADDA 12

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