SkillSwap Weekend - Usability Testing

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SkillSwap Weekend - Usability Testing

  1. 1. Usability TestingKevin SchaeferGabi Marcu
  2. 2. Why make something usable?Necessary for survival
  3. 3. The customer is always rightYou can’t blame the user
  4. 4. How is usability defined?LearnabilityEfficiencyMemorabilityErrorsSatisfactionfrom Jakob Nielsen’s “Usability Engineering”
  5. 5. Why test usability?
  6. 6. Your best guess isn’t good enough
  7. 7. Your best guess isn’t good enough
  8. 8. We don’t understand ourselvesas well as we think we do
  9. 9. Smart phone habitsWhat percentage of the time do youhave your smart phone on you?
  10. 10. Smart phone habitsWhat percentage of the time do youhave your smart phone on you?~60%Dey et al. 2011
  11. 11. You are not the user
  12. 12. Why not just ask?People lie.
  13. 13. What is usability testing?Method of evaluating the ease-of-useof a system through directobservation.
  14. 14. What is usability testing not?
  15. 15. ✔ ✘ User Usability Expert Behavior OpinionDirect Observation Indirect Structured Ethnographic via McGill University
  16. 16. Not focus groups.Not market research.
  17. 17. When to test usability?Early & often.
  18. 18. Low fidelity High fidelity
  19. 19. Wizard of Oz Technique
  20. 20. Practical approachesto usability testing
  21. 21. Running a usability test1) Choose tasks2) Choose users3) Perform the test
  22. 22. Running a test: Choosing tasksVery specificRepresentative of target usesMost important parts of UINot too short, not too longStart simple, end simple
  23. 23. 1) “Enter sales figures for six regionsfor each of four quarters, with thesenumbers.”2) “Calculate totals and percentages ofthe data.”
  24. 24. Running a test: Choosing usersRepresentative of target usersMust be novicesOptional: trainingDon’t repeat on different designs
  25. 25. Running a test: Perform the test“We’re testing the software. Not you.”One experimenterRefrain from interaction with user *No personal opinionsYou are a peer. Not an expert.Optional: Video recordingOptional: Think-Aloud Technique
  26. 26. “Thinking aloud may be the singlemost valuable usability engineeringmethod.”
  27. 27. Think-Aloud TechniqueReveals how users view and interpretthe UIUsers continuously think out loudWealth of qualitative dataUnnatural/difficult for usersAvoid rationalizations of thoughts
  28. 28. Good: “What are you thinking now?”from Jakob Nielsen’s “Usability Engineering”
  29. 29. Bad: “What do you think the messageon the bottom of the screen means?”from Jakob Nielsen’s “Usability Engineering”
  30. 30. Demo of Think-Aloud Technique
  31. 31. Running a usability test1) Choose tasks2) Choose users3) Perform the test
  32. 32. Kevin Schaefer kjschaef@andrew.cmu.edThank you. u Gabi Marcu

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