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Principles of usability Principles of usability Presentation Transcript

  • Principles of Usability
  • Usability
    ONE DEFINITION OF USABILITY…
    “When you conveniently can use a product or service and it meets your expectations.”
  • Human performance and abilities WHAT NEED TO BE CONSIDERED IN USABILITY
    Readability
    Ergonomics
    Vision
    Human memory
    Design
    Learnability
    #1) Bailey (Human Performance), #2) NASA – On the typography of flightdeckcommunication
  • Design
    Visceral design - first see feeling
    Behavioural design - the feeling of using the device
    Reflective design - what the design communicates
    WHAT HAS DESIGN GOT TO DO WITH USABILITY?
    Don Norman, the authority in User Interfaces
  • Perceiving the world
    AFFORDANCE, the cues (knowledge in the world) that something signals.
    Inserthere
    Logotype – access to my bank
    Clear and instructive display
    Understandable legends
    Numericalkeysclearlyseparated
    Understandablebuttons
    Screw on battery lid tellscustomer - ”Yes, can be opened, butonlywhenneeded”
  • Learnability
    LEARNABILITY IS IMPORTANT
    Learnability is achieved by
    • Symmetry in functions (routinecognitiveskills)
    • Visual cues (knowledge in the world)
    • Feedback, Information and Decision
    • Fitusers mental model (knowledge in the head)
    • Repeateduse
  • Knowledge in the head
    THINGS CAN APPEAR EASY…
    A+B=110
    A is 100 morethan B.
    What is B?
  • Knowledge in the head
    THINGS CAN APPEAR EASY…
    A+B=110
    A is 100 morethan B.
    What is B?
    B=5
  • Knowledge in the world
    ADDING CONTEXT
    Increasedawareness
    Increasedcognitiveprocessing for the relevant details
    Increasedusability
    Understandablefunction
    Increasedintent (moresecure).
  • Knowledge in the world – The 10€ note
    But, what’s on the frontside?
  • Knowledge in the world – The 10€ note
    The seethrough
    split ”10”
    But, what’s on the frontside?
    ECB President
    signature
    Hypotethical
    doorway
    architecture
    Microprint
    Euro flag
  • Perceiving the world?
    SOME THINGS ARE JUST HARDWIRED…..
    Can you spot the difference?
  • Perceiving the world?
    SOME THINGS ARE JUST HARDWIRED…..
    Can you spot the difference?
  • Exploring the World
    SEARCH AND EXPLORE
    Search and explore is howpeoplelearn new complexthings and products.
    Example is the remotecontrol, dotightropewalking or your new iPod etc.
    Would you daredotightropewalking?
  • Exploring the World
    WHEN DO SEARCH AND EXPLORE STOP?
    People are afraid of loosing - by human design
    When that happens - search and explore stops
    Same line, just different location - still same answer?
    The same goes for PIN…
  • Design
    DESIGN IS IMPORTANT
    Design is important, wrongcueswill cause problems
    And Securityhave to be balanced with usability
    Usability and Securityhaveopposingvalue, and need to be balanced
  • Trust
    TRUST IS THE RESULT OF A USABLE PRODUCT
    Trust comes from meeting and beating customer expectations.
    T=r+d
    Trust = reliability + delight
  • Whatis usability?USABILITY IS ABOUT MAKING THINGS EASY AND UNDERSTANDABLE FOR THE USER
  • Progressive Disclosure
    FOCUS ON RELEVANCE
  • Progressive Disclosure
    FOCUS ON RELEVANCE
  • What is usability?
    SUCCESS CRITERIA’S FOR A SECURITY SOLUTION
    • User friendly
    • Logical functionality
    • Reason of usage
    • No cryptic texts
    • I-follow-you
    • Context support
    • Portability.
  • Books I wouldrecommend
    GOOD LITTERATURE FOR PRODUCT MANAGERS AND USABILITY SPECIALISTS
    Emotional Design – Don Norman
    PredictablyIrrrational – Dan Ariely
    The design of everydaythings – Don Norman
    Human Performance Engineering - Bailey
  • Thank You
    23
    06/07/2011