An Empirical Study of the Minimum Required Size and the Minimum Number of Targets for Pen Input on the Small Display

Mizobuchi, Sachi; Mori, Koichi; Ren, Xiangshi; Yasumura, Michiaki

doi:10.1007/3-540-45756-9_15

Cited by 12 publications

(10 citation statements)

References 2 publications

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“…A number of studies that consider appropriate target sizes for touchscreen use have already been conducted both for PDAs [2,9,10,11,18] and desktop-sized touch-sensitive displays [3,16]. Unfortunately, recommendations from studies conducted to date are not strictly applicable to our work.…”

Section: Related Workmentioning

confidence: 92%

Target size study for one-handed thumb use on small touchscreen devices

Parhi

Karlson

Bederson

2006

Proceedings of the 8th Conference on Human-Computer Interaction With Mobile Devices and Services

276

187

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This paper describes a two-phase study conducted to determine optimal target sizes for one-handed thumb use of mobile handheld devices equipped with a touch-sensitive screen. Similar studies have provided recommendations for target sizes when using a mobile device with two hands plus a stylus, and interacting with a desktop-sized display with an index finger, but never for thumbs when holding a small device in a single hand. The first phase explored the required target size for single-target (discrete) pointing tasks, such as activating buttons, radio buttons or checkboxes. The second phase investigated optimal sizes for widgets used for tasks that involve a sequence of taps (serial), such as text entry. Since holding a device in one hand constrains thumb movement, we varied target positions to determine if performance depended on screen location. The results showed that while speed generally improved as targets grew, there were no significant differences in error rate between target sizes ≥ 9.6 mm in discrete tasks and targets ≥ 7.7 mm in serial tasks. Along with subjective ratings and the findings on hit response variability, we found that target size of 9.2 mm for discrete tasks and targets of 9.6 mm for serial tasks should be sufficiently large for one-handed thumb use on touchscreen-based handhelds without degrading performance and preference.

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Section: Related Workmentioning

confidence: 92%

Target size study for one-handed thumb use on small touchscreen devices

Parhi

Karlson

Bederson

2006

Proceedings of the 8th Conference on Human-Computer Interaction With Mobile Devices and Services

276

187

View full text Add to dashboard Cite

show abstract

“…Parhi et al [22] investigated the effect of target size on input accuracy when operating a PDA one handed with the thumb. Previously, others had determined appropriate target sizes for pen-based interaction on mobile touchscreen devices [19], and index fingers for interaction on desktop-sized displays [9,28], but pens and index fingers are smaller than thumbs and their use scenarios differ from the mechanic constraints of holding the screen with the same hand used for interaction.…”

Section: One Handed Interactionmentioning

confidence: 99%

ThumbSpace: Generalized One-Handed Input for Touchscreen-Based Mobile Devices

Karlson

Bederson

2007

Lecture Notes in Computer Science

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Abstract. In this paper, we present ThumbSpace, a software-based interaction technique that provides general one-handed thumb operation of touchscreenbased mobile devices. Our goals are to provide controlled and accurate selection of all interface objects, especially small and far targets, which are traditionally difficult to interact with using the thumb. ThumbSpace is designed to provide these benefits independent of the application design, which can free designers to focus on effective presentation, as well as efficient interaction when two hands are available. We present the ThumbSpace design and a comparative evaluation against direct interaction for target selection. Our results show that in addition to being well received, ThumbSpace improves accuracy for selecting targets that are out of thumb reach, and makes users as effective at selecting small targets as large targets. The results further suggest user practice and strategic design iterations hold potential to close the gap in access time between the two input methods, where ThumbSpace does not do as well as direct interactions.

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“…Apart from these, there have been several studies to provide tactile feedback for finger based text entry [2], to understand the problems involved in the bilingual keypad layout of mobile handsets [8] and to evolve guidelines for the button sizes [18,13] for old persons [10,19].…”

Section: Related Workmentioning

confidence: 99%

One-Handed Thumb Use on Smart Phones by Semi-literate and Illiterate Users in India

Katre¹

2010

Human Work Interaction Design: Usability in Social, Cultural and Organizational Contexts

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Abstract. There is a tremendous potential for developing mobile-based productivity tools and occupation specific applications for the semi-literate and illiterate users in India. One-handed thumb use on the touchscreen of smart phone or touch phone is considered as an effective alternative than the use of stylus or index finger, to free the other hand for supporting the occupational activity. In this context, usability research and experimental tests are conducted to understand the role of fine motor control, usability of thumb as the interaction apparatus and the ergonomic needs of users. The paper also touches upon cultural, racial and anthropometric aspects, which need due consideration while designing the mobile interface. Design recommendations are evolved to enhance the effectiveness of one-handed thumb use on smart phone, especially for the benefit of semi-literate and illiterate users.

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An Empirical Study of the Minimum Required Size and the Minimum Number of Targets for Pen Input on the Small Display

Cited by 12 publications

References 2 publications

Target size study for one-handed thumb use on small touchscreen devices

Target size study for one-handed thumb use on small touchscreen devices

ThumbSpace: Generalized One-Handed Input for Touchscreen-Based Mobile Devices

One-Handed Thumb Use on Smart Phones by Semi-literate and Illiterate Users in India

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