Validation level: 5. CHI, UIST, CSCW and TOCHI paper publication
Most tablets use just one hand for interaction, so the study designed a Bimanual interaction.
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Storyboard of Functions
Five spontaneous holds (portrait orientation). The authors applied a preliminary experiment to find out the natural holding position of users and define these holds separately.
Users can use the thumb and fingers of the support hand for interaction. Authors designed interactive zones on the edges of the tablet, corresponding to the holds.
BiPad. a) Fside zone is active; other zones are shrunken. b) Unused zones remain partially visible if commands were assigned.
Using a finger to conduct press-and-release action within a BiPad zone
Use presses the ‘stroke’ button with the index finger and adds additional finger positions below. The user can adjust the stroke size by holding down a second finger on the appropriate button.
Gestures offer additional degrees of freedom for the thumb in the corner (up-to-down, right-to-left and diagonal). Small stroke shapes indicate the direction of the gesture and its function
Bimanual taps outperformed our one-handed control condition in both landscape and portrait orientations; bimanual chords and gestures in portrait mode only; and thumbs outperformed fingers, but were more tiring and less stable.
The study focus on the tablet. It would be nice to see how bimanual interaction works on other devices.