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Usability Testing (PowerPoint download)

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					Usability Testing

   COMP 6620
   User Interface Design
   Dr. Seals
What is usability?

  Usability means focusing on users
  People use products to be productive
  Users are busy people trying to
   accomplish tasks
  Users decide when a product is easy to
Why Usability Testing?

  To ensure that the product is usable for
   your user
  Usability testing should be an iterative
  Completed several times during the
   design and development life-cycle
  End result is an improved product and a
   better understanding of the users that
   we’re designing for (Kaufmann 2006)
Project Usability Testing

  Project Status
  Prototypes should be near completion
  Nov 10-30 Usability Testing
  Nov 14-Dec 4 Final Writeups&Evaluation
Usability Testing Components

  Pilot Test
  Usability Test
Usability Testing Components

    Pilot testing
      Designed to identify hidden issues and
       eliminate surprises.
      Pilot testing tests the methods of your actual
       study as a trial
      Not with actual users

      During pilot testing you can make
       modifications to your final study
Usability Testing Components

    Usability testing (Dumas & Reddish)
      Goal to improve usability of a product
      Participants represent real users
      Participants do real tasks
      You observe and record what participants
       do and day
      You analyze the data, diagnose the real
       problems, and recommend changes to fix
       those problems
How many people should I test?

    Discount usability methods (Nielson)
        Suggests 5 Users (we will use one more 6
         just to be on the safe side)
When to test?

  Nov10-Nov30
  Special Configurations on
        Second half of class please bring your
         laptop and running system to perform some
         user usability testing. This way you don’t
         have to track down users and the class will
         get a chance to see multiple systems
         running. So you will have all users in one
What do I need to perform a
Usability Test?
 1.  Approval from Institutional Review Board (IRB office
     on your university campus)
 2.  Usability Testing Protocol, Instruments, Prototype
       Perform Pilot to validate Protocol & Instruments
       Perform Usability test
         Collect background demographics about users
          (Pretest questionnaire)
         Task List to guide user through usability test
         Collect data about test or user acceptance
          (Post test questionnaire)
         Analyze test
         Write testing results
What do I need to perform a
Usability Test?
    Approval from Institutional Review Board
     (IRB office on your university campus)
    When you perform any experiment that
     involves human subjects you must receive
     consent from the Auburn Institutional
     Review Board if we plan to use the data
     collected in a publication. Just to make sure
     you are aware of any concerns that your
     study may impose on participants
Information Sheet given to users
Pretest Questionnaire

    To Obtain user demographics so that
     you are able to out biases in experiment
     that may be caused by age or
Task List

    Contains multiple tasks or items (for our
     purposes 6, 12 or 18 tasks) that the user
     has to find or perform.
Post test Questionnaire

    Ben Shneiderman, Design the User
Post test Questionnaire

  Written user surveys are a familiar,
   inexpensive and generally acceptable
   companion for usability tests and expert
  Acceptance Tests

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