The single-finger keyboard layout problem

Dell’Amico, Mauro; Díaz, José Carlos Díaz; Iori, Manuel; Montanari, Roberto

doi:10.1016/j.cor.2009.01.018

Cited by 31 publications

(21 citation statements)

References 36 publications

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“…For example, a few studies have proposed mobile device keyboard layouts that deviate from the standard QWERTY keyboard in an attempt to increase productivity [10]–[12]. However, alternative keyboard layouts that deviate from the standard QWERTY layout pose usability problems because they greatly affect important design considerations such as learnability and familiarity.…”

Section: Introductionmentioning

confidence: 99%

A Data-Driven Design Evaluation Tool for Handheld Device Soft Keyboards

et al. 2014

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Thumb interaction is a primary technique used to operate small handheld devices such as smartphones. Despite the different techniques involved in operating a handheld device compared to a personal computer, the keyboard layouts for both devices are similar. A handheld device keyboard that considers the physical capabilities of the thumb may improve user experience. We developed and applied a design evaluation tool for different geometries of the QWERTY keyboard using a performance evaluation model. The model utilizes previously collected data on thumb motor performance and posture for different tap locations and thumb movement directions. We calculated a performance index (PITOT, 0 is worst and 2 is best) for 663 designs consisting in different combinations of three variables: the keyboard's radius of curvature (R) (mm), orientation (O) (°), and vertical location on the screen (L). The current standard keyboard performed poorly (PITOT = 0.28) compared to other designs considered. Keyboard location (L) contributed to the greatest variability in performance out of the three design variables, suggesting that designers should modify this variable first. Performance was greatest for designs in the middle keyboard location. In addition, having a slightly upward curve (R = −20 mm) and orientated perpendicular to the thumb's long axis (O = −20°) improved performance to PITOT = 1.97. Poorest performances were associated with placement of the keyboard's spacebar in the bottom right corner of the screen (e.g., the worst was for R = 20 mm, O = 40°, L = Bottom (PITOT = 0.09)). While this evaluation tool can be used in the design process as an ergonomic reference to promote user motor performance, other design variables such as visual access and usability still remain unexplored.

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Section: Introductionmentioning

confidence: 99%

A Data-Driven Design Evaluation Tool for Handheld Device Soft Keyboards

et al. 2014

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“…In both tasks, regulatory resources are required to override an automatic behaviour or habit. In the Stroop task, resources are required to inhibit the automatic reading response on incompatible trials (i.e., saying "black" when seeing the word "red" appear in black font); similarly, in the reaction-time task used in the present study, resources are required to inhibit the automatic behavioural tendency to type using both hands (Crump & Logan, 2010;Dell'Amico et al, 2009).…”

Section: Discussionmentioning

confidence: 93%

Is “getting started” an effective way for people to overcome the depletion effect?

Walsh¹,

Mantonakis²,

Joordens

2015

Can J Adm Sci

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Whereas most research on depletion focuses on its effect on the overall performance of a subsequent task requiring self‐control, we examine the effect of depletion on self‐control after performance has begun. Across different manipulations of depletion and using different measures of self‐control (e.g., overriding an automatic behavioural tendency, enduring on a physically demanding task, and making healthy consumption choices), the results of three studies show that when self‐control has been initiated, the effect of depletion has little influence on subsequent behaviour also requiring self‐control: in other words, “getting started” on a self‐control task attenuates the depletion effect. The results also show that the way in which self‐control starts—that is, whether people choose to regulate, or whether this choice is forced—appears irrelevant. This research clarifies an effective way to facilitate self‐control after depletion, while providing a better understanding of the process underlying depletion. Copyright © 2015 ASAC. Published by John Wiley & Sons, Ltd.

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“…There are several studies that used QAP model in single finger keyboard layouts such as virtual keyboards (e.g., Ekş io glu and Soydal, 2010;Uş ş ak, 2004;Dell'Amico et al, 2009;Li et al, 2006). In these studies, distance matrix of the QAP model was mostly taken as the distance between the keys since in that case interkeystroke time is highly correlated with the distance between the keys.…”

Section: Keyboard Layout Optimizationmentioning

confidence: 99%