BrailleType Unleashing Braille over Touch

Screen Mobile Phones

Touch Interfaces

pleasant

Tactile feedback

loss of tactile feedback

Loss of physical stability

Difficult to select targets

Complex interactions

Familiar and simple.

BRAILLETYPE

Less and larger targets

Familar layout

Simple structured Interaction

Speed and

Timeouts

User Evaluation

15 blind users

24 to 68 years old

All but two text regularly

Only one had

previous

experience

with touch

screens

mobiles

Practice phase

10 to 15 minutes

Two users were

not able to write

with QWERTY

(VoiceOver)

Erase was

unavailable

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Participants

BrailleType

VoiceOver

2.11 1.45

VoiceOver

BrailleType

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

45.0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Participants

BrailleType

VoiceOver

14.1 8.9

VoiceOver

BrailleType

Easy to

comprehend. * Easy to use. *

Quickly write

text.

Would use this

system.

BrailleType 5 (0) 5 (1) 3 (1) 3 (2)

VoiceOver 4 (2) 4 (2) 4 (3) 3 (1)

(Median, Inter-quartile Range)

BrailleType simpler

albeit slower

Users prefer simpler to

faster

Several close targets and

Split-tapping were the main

error causes

The Future

BrailleTab

Long term study

BrailleType

Unleashing Braille over Touch Screen Mobile Phones

Hugo Nicolau hman@vimmi.inesc-id.pt

Extras

NAVTAP AND BRAILLETAP: NON-VISUAL TEXTING INTERFACES

Tiago Guerreiro, Paulo Lagoá, Pedro Santana, Daniel Gonçalves, Joaquim Jorge

RESNA 2008