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Leon Barnard

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Publications by Leon Barnard (bibliography)

» 2007 «

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Barnard, Leon, Yi, Ji Soo, Jacko, Julie A. and Sears, Andrew (2007): Capturing the effects of context on human performance in mobile computing systems. In Personal and Ubiquitous Computing, 11 (2) pp. 81-96

» 2005 «

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Barnard, Leon, Yi, Ji Soo, Jacko, Julie A. and Sears, Andrew (2005): An empirical comparison of use-in-motion evaluation scenarios for mobile computing devices. In International Journal of Human-Computer Studies, 62 (4) pp. 487-520

“There is a clear need for evaluation methods that are specifically suited to mobile device evaluation, largely due to the vast differences between traditional desktop computing and mobile computing. One difference of particular interest that needs to be accounted for is that mobile computing devices are frequently used while the user is in motion, in contrast to desktop computing. This study aims to validate the appropriateness of two evaluation methods that vary in representativeness of mobility, one that uses a treadmill to simulate motion and another that uses a controlled walking scenario. The results lead to preliminary guidelines based on study objectives for researchers wishing to use more appropriate evaluation methodologies for empirical, data-driven mobile computing studies. The guidelines indicate that using a treadmill for mobile evaluation can yield representative performance measures, whereas a controlled walking scenario is more likely to adequately simulate the actual user experience.”

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» 2004 «

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Jacko, Julie A., Barnard, Leon, Kongnakorn, Thitima, Moloney, Kevin P., Edwards, Paula J., Emery, V. Kathlene and Sainfort, Francois (2004): Isolating the effects of visual impairment: exploring the effect of AMD on the utility of multimodal feedback. In: Dykstra-Erickson, Elizabeth and Tscheligi, Manfred (eds.) Proceedings of ACM CHI 2004 Conference on Human Factors in Computing Systems April 24-29, 2004, Vienna, Austria. pp. 311-318. Available online

“This study examines the effects of multimodal feedback on the performance of older adults with an ocular disease, Age-Related Macular Degeneration (AMD), when completing a simple computer-based task. Visually healthy older users (n = 6) and older users with AMD (n = 6) performed a series of drag-and-drop tasks that incorporated a variety of different feedback modalities. The user groups were equivalent with respect to traditional visual function metrics and measured subject cofactors, aside from the presence or absence of AMD. Results indicate that users with AMD exhibited decreased performance, with respect to required feedback exposure time. Some non-visual and multimodal feedback forms show potential as solutions to enhance performance, for those with AMD as well as for visually healthy older adults.”

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Edwards, Paula J., Barnard, Leon, Emery, V. Kathlene, Yi, Ji Soo, Moloney, Kevin P., Kongnakorn, Thitima, Jacko, Julie A., Sainfort, Francois, Oliver, Pamela R., Pizzimenti, Joseph, Bade, Annette and Fecho, Greg (2004): Strategic design for users with diabetic retinopathy: factors influencing performance in a menu-selection task. In: Sixth Annual ACM Conference on Assistive Technologies 2004. pp. 118-125. Available online

“This paper examines factors that affect performance of a basic menu selection task by users who are visually healthy and users with Diabetic Retinopathy (DR) in order to inform better interface design. Interface characteristics such as multimodal feedback, Windows accessibility settings, and menu item location were investigated. Analyses of Variance (ANOVA) were employed to examine the effects of interface features on task performance. Linear regression was used to further examine and model various contextual factors that influenced task performance. Results indicated that Windows accessibility settings significantly improved performance of participants with more progressed DR. Additionally, other factors, including age, computer experience, visual acuity, and menu location were significant predictors of the time required for subjects to complete the task.”

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Jacko, Julie A., Emery, V. Kathlene, Edwards, Paula J., Ashok, Mahima, Barnard, Leon, Kongnakorn, Thitima, Moloney, Kevin P. and Sainfort, Francois (2004): The effects of multimodal feedback on older adults' task performance given varying levels of computer experience. In Behaviour and Information Technology, 23 (4) pp. 247-264

“This experiment examines the effect that computer experience and various combinations of feedback (auditory, haptic, and/or visual) have on the performance of older adults completing a drag-and-drop task on a computer. Participants were divided into three computer experience groups, based on their frequency of use and breadth of computer knowledge. Each participant completed a series of drag-and-drop tasks under each of seven feedback conditions (three unimodal, three bimodal, one trimodal). Performance was assessed using measures of efficiency and accuracy. Experienced users responded well to all multimodal feedback while users without experience responded well to auditory-haptic bimodal, but poorly to haptic-visual bimodal feedback. Based on performance benefits for older adults seen in this experiment, future research should extend investigations to effectively integrate multimodal feedback into GUI interfaces in order to improve usability for this growing and diverse user group.”

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» 2003 «

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Jacko, Julie A., Scott, Ingrid U., Sainfort, Francois, Barnard, Leon, Edwards, Paula J., Emery, V. Kathlene, Kongnakorn, Thitima, Moloney, Kevin P. and Zorich, Brynley S. (2003): Older adults and visual impairment: what do exposure times and accuracy tell us about performance gains associated with multimodal feedback?. In: Cockton, Gilbert and Korhonen, Panu (eds.) Proceedings of the ACM CHI 2003 Human Factors in Computing Systems Conference April 5-10, 2003, Ft. Lauderdale, Florida, USA. pp. 33-40.

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Emery, V. Kathlene, Edwards, Paula J., Jacko, Julie A., Moloney, Kevin P., Barnard, Leon, Kongnakorn, Thitima, Sainfort, Francois and Scott, Ingrid U. (2003): Toward achieving universal usability for older adults through multimodal feedback. In: Proceedings of the 2003 ACM Conference on Universal Usability 2003. pp. 46-53. Available online

“This experiment examines the effect of combinations of feedback (auditory, haptic, and/or visual) on the performance of older adults completing a drag-and-drop computer task. Participants completed a series of drag-and-drop tasks under each of seven feedback conditions (3 unimodal, 3 bimodal, 1 trimodal). Performance was assessed using measures of efficiency and accuracy. For analyses of results, participants were grouped based on their level of computer experience. All users performed well under auditory-haptic bimodal feedback and experienced users responded well to all multimodal feedback. Based on performance benefits for older adults seen in this experiment, future research should extend investigations to effectively integrate multimodal feedback into GUI interfaces in order to improve usability for this growing and diverse user group.”

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Changes to this page (author)

19 Feb 2010: Enabled abstracts to be shown on Leon Barnard's author page.
31 May 2009: Author was edited

27 Jun 2007: Author was edited
22 Jun 2007: Author was edited
22 Jun 2007: Author was edited
22 Jun 2007: Author was edited
28 Apr 2003: Added the author to the bibliography

Publication statistics

Publication period:2003-2007
Publication count:7
Number of co-authors:15

Productive colleagues

Leon Barnard's 3 most productive colleagues in number of publications:

Andrew Sears:71
Julie A. Jacko:69
Francois Sainfort:16

Collaboration count

Number of publications with 3 favourite co-authors:

Julie A. Jacko:7
Kevin P. Moloney:5
V. Kathlene Emery:5

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Learn more about Leon Barnard:
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Conference Calendar

Mar 22

Workshop on Pervasive healthcare in the home : Supporting patient motivation and engagement

Mar 22

UX People

Mar 22

ETRA '10 - Eye Tracking Research & Applications Symp.

Mar 21

“ Software design is the act of determining the user's experience with a piece of software. It has nothing to do with how the code works inside, or how big or small the code is. The designer's task is to specify completely and unambiguously the user's whole experience. ”

-- David Liddle, From Bringing Design to Software, edited by Terry Winograd, 1996 ”

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Leon Barnard

Publications by Leon Barnard (bibliography)

» 2007 «

» 2005 «

» 2004 «

» 2003 «

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Changes to this page (author)

Publication statistics

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Conference Calendar

Eva Hornecker on Tangible Interaction

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