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Abstract. This paper presents two studies investigating the use of novel modalities for bimanual vertical scrolling on tablet devices. Several bimanual interaction techniques are presented, using a combination of physical dial, touch and pressure input, which split the control of scrolling speed and scrolling direction across two hands. The new interaction techniques are compared to equivalent unimanual techniques in a controlled linear targeting task. The results suggest that participants can select targets significantly faster and with a lower subjective workload using the bimanual techniques.

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We present a study which describes the power consumption characteristics of a number of different interaction techniques on a desktop and laptop computer. In total, 8 interactions that can be used to carry out a single task (navigating a PDF document) were compared for power consumption across both a desktop and a laptop computer and across two different power saver settings. The results suggest that the power consumption of different interaction techniques for a single task vary significantly. Furthermore, the results suggest that a key factor in the power consumption of the interaction technique is the number of screen updates involved.

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