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Hvad er usability?

Hvad er usability?. IT Universitetet i København September 2005 John Paulin Hansen. Flexibility-usability tradeoff. De 8 gyldne regler. Konsistens - brydes mest ofte Understøt regelmæssige brugere Giv informativ feedback Afslut ordentligt Undgå fejl - og vær tolerant

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Hvad er usability?

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  1. Hvad er usability? IT Universitetet i København September 2005 John Paulin Hansen

  2. Flexibility-usability tradeoff

  3. De 8 gyldne regler • Konsistens - brydes mest ofte • Understøt regelmæssige brugere • Giv informativ feedback • Afslut ordentligt • Undgå fejl - og vær tolerant • Fortrydelsesmuligheder • Giv brugerne kontrollen • Undgå overlast af korttidshukommelsen - understøt chunking

  4. Fysiske grænser

  5. Psykologiske grænser

  6. Regelmæssige brugere

  7. Forhindre fejl

  8. Gould & Lewis 3 grundprincipper (1985) 1)Tidlig fokus på brugerne: Designere må i direkte kontakt med brugeren og forstå deres arbejde 2) Empiriske tests: Observationer, målinger og analyser på prototyper 3) Iterativt design: design, test, re-design, test osv.

  9. Designprincipper • På ordre (ovenfra) • Vandfaldsmodellen • analyse, kravsspecifikation,design, udvikling og test • Den iterative spiral: • Eksamination, definition, udvikling, eksamination, definition, udvikling......

  10. Grunde til dårlig usability • Fokus på teknik/maskine/system frem for brugeren • Brugergruppen har ændret sig • Design betragtes bare som ”common sense” • Systemelementerne udvikles separat af specialistgrupper som ikke koordineres • [fortsæt selv]

  11. Gazetalk • Commercial cameras • Type-to-talk • Synthetic speech • E-mail • MP3 player • PDF reader • Webbrowser • Freeware and Open Source • Danish, English and Japanese versions

  12. Request Date: Tue, 06 Feb 2001 14:41:07 +0200 Hi there I stay in South Africa and my father has had a brain stem stroke. He cannot move or speak. He can communicate with his eyes. We are currently using an alphabet chart, but it takes too long and he gets tired quickly. I'm looking for some type of EyeMouse. Something we can plug into a PC, Design like a virtual keyboard. Can you please advise me. I will appreciate any help. Thanks Nuno Lourenco

  13. Reply Dear Nuno, I'm sorry to tell you but eye trackers that are accurate enough for your father to indicate at which letter your father is looking at are much too expensive and are not available for private use. If your father still can hear, you can ask him to look left or right or up or down under certain conditions. It may work as a yes or no. Lo Bour, PhD Department of Neurology/Clinical Neurophysiology, H2-222 Academic Medical Centre, University of Amsterdam

  14. System requirements • Fast • Robust • Mobile • Affordable • Changes with progress of diseases

  15. Progress of ALS disease(amyotrophic lateral sclerosis) • Loss of voice • Reduced control of arms and legs • Reduced control of fingers • Reduced head movements • Just eye movements

  16. Problems with some existing systems • Difficult or impossible to calibrate - needs helper • Mostly for stationary, indoor use • Requires a rather complicated installation by computer experts • The price is prohibitive (more than 10.000 $)

  17. Standard cameras and PC Web cam Video cam • Advantages: • High availability • Instant operation • Low cost • Steady increase in performance • System support

  18. Design Proces • 2000: DKM-studerende lavede prototype • 2001: Usability studenter testede første version og kom med kritik • 2002: Forbedrede versioner testes af ALS-patienter og usabilitystudenter afprøver nyt indtastningsprincip • 2003: Kontrollerede eksperimenter • 2005: Udvides med MP3 spiller og PDF-læser.

  19. Forbedringsforslag

  20. Means-end of requirements

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