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Summary: 16
Two-Handed Marking Menus for Multitouch Devices
KENRICK KIN, University of California, Berkeley and Pixar Animation Studios
BJ ĻORN HARTMANN and MANEESH AGRAWALA, University of California, Berkeley
We investigate multistroke marking menus for multitouch devices and we show that using two hands
can improve performance. We present two new two-handed multistroke marking menu variants in which
users either draw strokes with both hands simultaneously or alternate strokes between hands. In a pair
of studies we find that using two hands simultaneously is faster than using a single, dominant-handed
marking menu by 1015%. Alternating strokes between hands doubles the number of accessible menu items
for the same number of strokes, and is similar in performance to using a one-handed marking menu. We also
examine how stroke direction affects performance. When using thumbs on an iPod Touch, drawing strokes
upwards and inwards is faster than other directions. For two-handed simultaneous menus, stroke pairs
that are bilaterally symmetric or share the same direction are fastest. We conclude with design guidelines
and sample applications to aid multitouch application developers interested in using one- and two-handed
marking menus.
Categories and Subject Descriptors: H.5.2 [Information Interfaces and Presentation]: User Interfaces--
interaction styles
General Terms: Design, Human Factors
Additional Key Words and Phrases: Two-handed multistroke marking menus, multitouch
ACM Reference Format:
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