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  • Konsistens: Logoer, eksponeringseffekten, ensartet placering, designprogram, Understøttelse af regelmæssige brugere: shortcuts, modificering af menuer, cockies Afslut ordentligt: Chekout procedurer, feedback, kvitteringer Tolerance: eksempelvis ikke genudfylde en hel blanket hvis man skriver forkort postnummer. Brugerkontrol: Brugerne skal være initiativtagere til alle handlinger, ikke respondenter
  • Flash
  • Brugergruppen ændrer sig: Eksempelvis systemer der oprindeligt blev brugt af nørder og hackere, som alle nu skal/vil bruge Separat udvikling: Eksempelvis en gruppe som udvikler interface, en gruppe laver hjælpefunktioner og en tredie gruppe laver den skriftlige dokumentation

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  • 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
    • Fortrydelsesmuligheder
    • Giv brugerne kontrollen
    • Undgå overlast af korttidshukommelsen - understøt chunking
    View slide
  • Fysiske grænser View slide
  • Psykologiske grænser
  • Regelmæssige brugere
  • Forhindre fejl
  • 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.
  • Designprincipper
    • På ordre (ovenfra)
    • Vandfaldsmodellen
      • analyse, kravsspecifikation,design, udvikling og test
    • Den iterative spiral:
      • Eksamination, definition, udvikling, eksamination, definition, udvikling......
  • 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]
  • Gazetalk
    • Commercial cameras
    • Type-to-talk
    • Synthetic speech
    • E-mail
    • MP3 player
    • PDF reader
    • Webbrowser
    • Freeware and Open Source
    • Danish, English and Japanese versions
  • 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
  • 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
  • System requirements
    • Fast
    • Robust
    • Mobile
    • Affordable
    • Changes with progress of diseases
  • 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
  • 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 $)
  • Standard cameras and PC
    • Advantages:
      • High availability
      • Instant operation
      • Low cost
      • Steady increase in performance
      • System support
    Video cam Web cam
  • 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.
  • Forbedringsforslag
  • Means-end of requirements