typing performance of blind users: an analysis of touch behaviors, learning, and in-situ usage
TRANSCRIPT
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TYPING PERFORMANCE OF
BLIND USERS HUGO NICOLAU
KYLE MONTAGUETIAGO GUERREIRO
ANDRÉ RODRIGUESVICKI L. HANSON
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accessibility :: explore by touch
“Messages. Double-tap to open”
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text-entry :: explore by touch
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previous :: alternative techniques
Bonner et al., 2010
Azenkot et al., 2012
Oliveira et al., 2011
Southern et al., 2012
Yfantidis et al., 2006
Guerreiro et al., 2015
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problem:: lack of understanding
Words per Minute
Error Rate
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problem:: how to improve?
?
??
?
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contribution :: new knowledge
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contribution :: how? why?1 2 3 4 5 6 7 8
1.6 4.0Wor
ds p
er M
inut
e
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contribution :: longitudinal study
8
weeks
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participants:: novice
5users
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apparatus :: S3 mini
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procedure :: weekly assessment
week week week week week week week week
20-minute typing tasks
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apparatus :: in-situ usage
TinyBlackBoxSupporting Mobile In-The-Wild Studies
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results
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words per minutehow?
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performance :: words per minute
1 2 3 4 5 6 7 81
2
3
4
5
P2P4P1P3P5
Wor
ds p
er M
inut
e
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performance :: words per minute
1 2 3 4 5 6 7 81
2
3
4
5
P2P4P1P3P5
Wor
ds p
er M
inut
e
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performance :: words per minute
1 2 3 4 5 6 7 81
2
3
4
5
P2P4P1P3P5
Wor
ds p
er M
inut
e
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performance :: words per minute
1 2 3 4 5 6 7 81
2
3
4
5
P2P4P1P3P5
Wor
ds p
er M
inut
e
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words per minutewhy?
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wpm :: land-on accuracy
27% (SD=12)
48% (SD=15)
week 1 week 8
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wpm :: movement efficiency
P1 Week 1 P1 Week 8
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wpm :: less re-entries
1 2 3 4 5 6 7 8
6.60.8
week
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error rateshow?
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performance :: total error rate
1 2 3 4 5 6 7 80%
10%
20%
30%
40%
50%P1P2P3P4P5
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performance :: uncorrected error rate
1 2 3 4 5 6 7 80%
5%
10%
15%
20%
25%P1P2P3P4P5
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performance :: corrected error rate
3 out of 10deleted characters
were correct
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performance :: correction time
1 2 3 4 5 6 7 8
32 13Corr
ectio
n Ti
me
(%)
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types of errors :: performance
1 2 3 4 5 6 7 80%
5%
10%
15%
20%
25% SubstitutionsOmissionsInsertions
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substitutionswhy?
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types of errors :: slips
38%
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types of errors :: feedback delay
64%
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substitutions :: key not visited
36%
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major results
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summary :: major results
Improve performance at slow rate Due to several factorsSubstitutions are predominantCorrect most errors Corrections are time consuming
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summary :: major results
Improve performance at slow rate Due to several factorsSubstitutions are predominantCorrect most errors Corrections are time consuming
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summary :: major results
Improve performance at slow rate Due to several factorsSubstitutions are predominantCorrect most errors Corrections are time consuming
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summary :: major results
Improve performance at slow rate Due to several factorsSubstitutions are predominantCorrect most errors Corrections are time consuming
![Page 39: Typing Performance of Blind Users: An Analysis of Touch Behaviors, Learning, and In-Situ Usage](https://reader035.vdocuments.us/reader035/viewer/2022062821/5888dbb31a28aba1058b6739/html5/thumbnails/39.jpg)
summary :: major results
Improve performance at slow rate Due to several factorsSubstitutions are predominantCorrect most errors Corrections are time consuming
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implications
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correction :: easier and efficient
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synchronization :: output and input
“H”“B”
“N”
“M”
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touch models :: leverage movement
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HUGO NICOLAUhttp://web.ist.utl.pt/hugo.nicolau
TYPING PERFORMANCE OF BLIND USERS
SOS