Title
Effect of target size on non-visual text-entry.
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.
Year
DOI
Venue
2016
10.1145/2935334.2935376
MobileHCI
Field
DocType
Citations 
Words per minute,Computer science,Touchscreen,Speech recognition,Ranging,Typing,Multimedia,Key size,Text entry
Conference
2
PageRank 
References 
Authors
0.37
15
5
Name
Order
Citations
PageRank
André Rodrigues13813.25
Hugo Nicolau238134.33
Kyle Montague314721.54
Luis Carrico450666.22
Tiago Guerreiro536645.90