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Usability lecture 05102010
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Usability lecture 05102010



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  • 1. Introducing usability What makes a site or a service usable?
  • 2. Today Introduction of the usability concept Usable websites Usability testing Usability assignment….
  • 3. Introducing usability
  • 4. What causes usability problems?
  • 5. Usable websites
  • 6. Usability guidelines….
  • 7. Ohters… Yahoo design patterns …. (just Google)
  • 8. Usability testing
  • 9. Usability testing… Usability testing generally involves setting a series of tasks for people to complete and noting any problems they encounter – It’s as simple as that!
  • 10. Ways to test usability
  • 11. What to do? Team up with a parnter Select 3-5 test participants Minimum 2 tasks 30-50 min. each One of you is notetaker, one of you is moderator
  • 12. Where to find participants Friends and family Co-students (not in this class) …
  • 13. Tell the participant… “We’re testing the WEBSITE, not you” “Think out loud as much as possible” “Be brutally honest - we need your help!”
  • 14. You, the moderator Don’t help them complete tasks Ask “Why” and “What are you thinking” Answer questions with questions
  • 15. Moderating questions… “What are you currently thinking?” “Describe the steps you’re going through here” “What do you think will happen next?” “Is that what you expected to happen?” “That was confusing?” “And you were expecting ...?” “Would you mind repeating that again?”
  • 16. Testing errors Not doing a proper run through of the test in advance Incomplete or buggy prototypes Not scheduling enough time between sessions Bad task design Accidental Revelation Getting frustrated or losing detachment
  • 17. Wrapping up… Answer any questions they may have Thank them for their help and show them out Capture any important notes immediatly Prepare for the next test
  • 18. Think aloud protocol As the name suggests, you set a series of tasks and ask the subject to verbalise their thoughts and feelings by ‘thinking aloud’. The object of this is to gain valuable insight into the thought processes behind the users actions.
  • 19. Performance metrics Completion Rates – Are users able to complete the task? Time on Task – How long does it take users to complete? Page Views – How many pages does it take to complete? Errors – The number and severity of errors per task? Satisfaction – How does the user rate the system?
  • 20. Good and bad tasks Bad: Search for a bookcase Good: You have 200+ books in your fiction collection, currently in boxes strewn around your living room. Find a way to organize them.
  • 21. Testing plan Introduce the project State the goals of the test Profile your desired test subjects Outline your testing methodology Define your tasks Write a testing script Example:
  • 22. Schedule Week 5: Introduction assignment & draft test plan Week 6: Feedback on test plan Week 8: Deadline test report & presetation
  • 23. Sites to test…. Do you know a (professional) site you would like to test? Search e.g.