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Effect of target size on non-visual text-entry

Lookup NU author(s): Dr Kyle Montague

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Abstract

Touch-enabled devices have a growing variety of screen sizes; however, there is little knowledge on the effect of key size on non-visual text-entry performance. We conducted a user study with 12 blind participants to investigate how non-visual input performance varies with four QWERTY keyboard sizes (ranging from 15mm to 2.5mm). This paper presents an analysis of typing performance and touch behaviors discussing its implications for future research. Our findings show that there is an upper limit to the benefits of larger target sizes between 10mm and 15mm. Input speed decreases from 4.5 to 2.4 words per minute (WPM) for targets sizes below 10mm. The smallest size was deemed unusable by participants even though performance was in par with previous work.


Publication metadata

Author(s): Rodrigues A, Nicolau H, Montague K, Carriço L, Guerreiro T

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 18th International Conference on Human-Computer Interaction with Mobile Devices and Services

Year of Conference: 2016

Pages: 47-52

Print publication date: 06/09/2016

Online publication date: 06/09/2016

Acceptance date: 01/03/2016

Publisher: ACM

URL: http://dx.doi.org/10.1145/2935334.2935376

DOI: 10.1145/2935334.2935376

Library holdings: Search Newcastle University Library for this item

ISBN: 9781450344081


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