Effect of target size on non-visual text-entry

André Rodrigues, Hugo Nicolau, Kyle Montague, Luís Carriço, Tiago Guerreiro

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)

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 nonvisual 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.

Original languageEnglish
Title of host publicationProceedings of the 18th International Conference on Human-Computer Interaction with Mobile Devices and Services, MobileHCI 2016
PublisherAssociation for Computing Machinery, Inc
Pages47-52
Number of pages6
ISBN (Electronic)9781450344081
DOIs
Publication statusPublished - 6 Sep 2016
Externally publishedYes
Event18th International Conference on Human-Computer Interaction with Mobile Devices and Services, MobileHCI 2016 - Florence, Italy
Duration: 6 Sep 20169 Sep 2016

Publication series

NameProceedings of the 18th International Conference on Human-Computer Interaction with Mobile Devices and Services, MobileHCI 2016

Conference

Conference18th International Conference on Human-Computer Interaction with Mobile Devices and Services, MobileHCI 2016
CountryItaly
CityFlorence
Period6/09/169/09/16

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