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A Long Term Study with
Excluded Blind Users
Tiago Guerreiro
Hugo Nicolau
Joaquim Jorge
Daniel Gonçalves
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‘‘
’’
Never doubt that a small group of committed
people can change the world.
Indeed it is the only thing that ever has.
— Margaret Mead
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We have the whole world in our hands.
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SMS and Mail have had an
enormous growth in the last few years.
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Mobile devices can do anything.
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A common image for me.
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What about the
Others ?
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Some can only see this.
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They are too heavy.
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They are too big.
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They are too expensive...
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And definitely not mobile.
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Can speech synthesis replace
visual feedback?
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Early and
adventitious
Blind
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Variety of
Causes
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Collateral Damages
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Keep it Simple.
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ABCDEFGHIJLMNOPQRSTUVXZ
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A B C D
E F G H
I J L M N
O P Q R S T
U V X Z
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A B C D
E F G H
I J L M N
O P Q R S T
U V X Z
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A B C D
E F G H
I J L M N
O P Q R S T
U V X Z
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A B C D
E F G H
I J L M N
O P Q R S T
U V X Z
A BCD E FGH I JLMN O PQRST U VXZ
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We can navigate in any direction.
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A BCDEFGHIJLMNOPQRSTUVX Z
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A B C D
E F G H
I J L M N
O P Q R S T
U V X Z
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A B C D
E F G H
I J L M N
O P Q R S T
U V X Z
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A B C D
E F G H
I J L M N
O P Q R S T
U V X Z
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No wrong choices.
Just shorter paths.
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No memorization required.
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Short term Evaluation
Guerreiro et al., NavTap and BrailleTap: Non-Visual
input interfaces, In RESNA 2008
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Session
Rate
Error Rate
0%
10%
20%
30%
40%
50%
60%
70%
80%
1 2 3
MultiTap NavTap
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0.80
0.88
0.68
1.07
1.32
1.37
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1 2 3
MultiTap NavTap
Words Per Minute
Session
WPM
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Ease first contact
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And still leaves
room for
improvement
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How does it
behave on a long
term basis?
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In real life...
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How it affects the
users and their
habits?
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Understand the limits
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The user sample
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49 to 64 years
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Reduced to
performing and
taking calls
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Calls
Info
Dial
Accept
Reject
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SMS
Write
Read
Send
Receive
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Agenda
Notebook
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Study stages
Iterative (Re-)design Learning the basics (users)
Improving the prototype (us)
Evaluation Weekly laboratorial evaluation
Daily usage logging
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3 weeks
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3 sessions per week
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30 minutes per session
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Navigation Text-Entry
Events
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Navigation
Text-Entry Events
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Navigation
Text-Entry
Events
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Fine Tuning
the prototype
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Weekly Controlled Results
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5 users
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16 weeks
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Words per Minute
0
1
2
3
4
5
6
7
8
9
P01 P02 P03 P04 P05
First session Last session
WPM
Participant
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0
1
2
3
4
5
6
7
8
P01 P02 P03 P04 P05
First Session Last Session
4way - 2.85
2way - 4.88
Keystrokes per Character KSPC
Participant
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0%
10%
20%
30%
40%
50%
60%
70%
80%
P01 P02 P03 P04 P05
Preparation Time Navigation Time (same direction)
Navigation Time (direction shift)
0.45
0.58
1.25
0.8
1.22
0.30 0.45
0.58
0.62
1.1
1.08
0.8
1.25
1.24
0.8
1.0
1.22
1.16
1.93
0.83
Improvement in Interaction Times
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MSD Error Rate
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
P01 P02 P03 P04 P05
Participant
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0
1
2
3
4
5
Participants’ Opinion Rate
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Daily Usage
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Communication Method
0% 20% 40% 60% 80% 100%
P01
P02
P03
P04
P05
Calls SMS Participant
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Overall Results
1200 received
1825 sent
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Date Hour
Battery
Calculator
Alarm
Add Contact
Delete Contact
Search Contact
Make Call
Send SMS
Most Used Tasks
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Usage Influence
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0
1
2
3
4
5
6
P01 P02 P03 P04 P05
450
300
200
100
40
10
WPM vs. Sent SMSs
WPM
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0%
10%
20%
30%
40%
50%
60%
P01 P02 P03 P04
10 40 100 200 300 450
KSPC vs. Sent SMSs
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Observing each
Participant
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Participant 1 High Literacy Level
Used a 4-way approach
Near theoretical limit
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Participant 2
Learning difficulties
Able to use NavTap
Enormous social inclusion
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Participant 5
Low usage of text-messages
Social factors
Maintained his
navigation skills
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Conclusions
Accessible for a wider user group
Impact on Social Interactions
Still Using NavTap
Long Term Analysis is IMPORTANT
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The Future
Individual Differences
MultiTap learnability
MultiTap vs NavTap
(experienced )
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Kevin Clarkson Martin Rotovnik