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NavTap: A Long Term Study with Excluded Blind Users
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NavTap: A Long Term Study with Excluded Blind Users

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  • 1. A Long Term Study with Excluded Blind Users Tiago Guerreiro Hugo Nicolau Joaquim Jorge Daniel Gonçalves tjvg@vimmi.inesc-id.pt
  • 2. ‘‘ Never doubt that a small group of committed people can change the world. ’’ Indeed it is the only thing that ever has. — Margaret Mead
  • 3. We have the whole world in our hands.
  • 4. SMS and Mail have had anenormous growth in the last few years.
  • 5. Mobile devices can do anything.
  • 6. A common image for me.
  • 7. What about the Others ?
  • 8. Some can only see this.
  • 9. They are too heavy.
  • 10. They are too big.
  • 11. They are too expensive...
  • 12. And definitely not mobile.
  • 13. Can speech synthesis replacevisual feedback ?
  • 14. Early andadventitiousBlind
  • 15. Variety of Causes
  • 16. Collateral Damages
  • 17. Keep it Simple.
  • 18. ABCDEFGHIJLMNOPQRSTUVXZ
  • 19. A BCDE FGHI JLMNO PQRSTU VXZ
  • 20. A BCDE FGHI JLMNO PQRSTU VXZ
  • 21. A BCDE FGHI JLMNO PQRSTU VXZ
  • 22. A BCD E FGH I JLMN O PQRST U VXZA BCD E FGH I JLMN O PQRST U VXZ
  • 23. We can navigate in any direction.
  • 24. A BCDEFGHIJLMNOPQRSTUVX Z
  • 25. ABCDEFGHI JLMNOPQRSTUVXZ
  • 26. ABCDEFGHI JLMNOPQRSTUVXZ
  • 27. ABCDEFGHI JLMNOPQRSTUVXZ
  • 28. No wrong choices. Just shorter paths.
  • 29. No memorization required.
  • 30. Short term EvaluationGuerreiro et al., NavTap and BrailleTap: Non-Visualinput interfaces, In RESNA 2008
  • 31. Error RateRate80%70%60%50%40%30%20%10%0% 1 2 3 MultiTap NavTap Session
  • 32. Words Per MinuteWPM1.61.4 1.37 1.321.2 1.071.00.8 0.88 0.80 0.680.60.40.20.0 1 2 3 MultiTap NavTap Session
  • 33. Ease first contact
  • 34. And still leavesroom forimprovement
  • 35. How does itbehave on a longterm basis?
  • 36. In real life...
  • 37. How it affects theusers and theirhabits?
  • 38. Understand the limits
  • 39. The user sample
  • 40. 49 to 64 years
  • 41. Reduced toperforming and taking calls
  • 42. Calls Info DialAcceptReject
  • 43. SMSWriteReadSendReceive
  • 44. AgendaNotebook
  • 45. Study stagesIterative (Re-)design Learning the basics (users) Improving the prototype (us)Evaluation Weekly laboratorial evaluation Daily usage logging
  • 46. 3weeks
  • 47. 3sessions per week
  • 48. 30minutes per session
  • 49. Navigation Text-Entry Events
  • 50. NavigationText-Entry Events
  • 51. NavigationText-Entry Events
  • 52. Fine Tuningthe prototype
  • 53. Weekly Controlled Results
  • 54. 5users
  • 55. 16weeks
  • 56. Words per MinuteWPM9876543210 P01 P02 P03 P04 P05 Participant First session Last session
  • 57. Keystrokes per CharacterKSPC876 2way - 4.88543 4way - 2.85210 P01 P02 P03 P04 P05 Participant First Session Last Session
  • 58. Improvement in Interaction Times Preparation Time Navigation Time (same direction) Navigation Time (direction shift)80% 0.58 1.0870% 0.30 0.58 1.22 0.45 0.62 1.2260% 0.45 1.1 1.25 1.2550% 0.8 0.8 1.16 0.840% 1.24 1.0 1.9330%20% 0.8310%0% P01 P02 P03 P04 P05
  • 59. MSD Error Rate9%8%7%6%5%4%3%2%1%0% P01 P02 P03 P04 P05 Participant
  • 60. Participants’ OpinionRate 5 4 3 2 1 0
  • 61. Daily Usage
  • 62. Communication MethodParticipant Calls SMS P05 P04 P03 P02 P01 0% 20% 40% 60% 80% 100%
  • 63. Overall Results1200 received1825 sent
  • 64. Most Used Tasks Date Hour Send SMS Battery Calculator Make Call Alarm Add Contact Delete Contact Search Contact
  • 65. Usage Influence
  • 66. WPM vs. Sent SMSsWPM 6 5 450 4 300 3 200 100 2 40 1 10 0 P01 P02 P03 P04 P05
  • 67. KSPC vs. Sent SMSs 10 40 100 200 300 45060%50%40%30%20%10%0% P01 P02 P03 P04
  • 68. Observing each Participant
  • 69. Participant 1 High Literacy Level Used a 4-way approach Near theoretical limit
  • 70. Participant 2 Learning difficulties Able to use NavTapEnormous social inclusion
  • 71. Participant 5Low usage of text-messages Social factors Maintained his navigation skills
  • 72. ConclusionsAccessible for a wider user groupImpact on Social InteractionsStill Using NavTapLong Term Analysis is IMPORTANT
  • 73. The FutureIndividual DifferencesMultiTap learnabilityMultiTap vs NavTap (experienced )
  • 74. Kevin Clarkson Martin Rotovnik
  • 75. NavTapA Long Term Study with ExcludedBlind Users Tiago Guerreiro tjvg@immi.inesc.pt

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