Information Technology Reference
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7.5 Discussion
According to the user feedback for this prototype application, we give some
comparative discussion to similar work from three aspects: learnability,
usability, and naturalness.
Learnability
To get used to this interface, users only need to remember three
symbols to complete the five gestures accomplished by finger trajectory
operation. Other gestures are just the same as the gestures people do
when they share real documents with others. What is more, the three
symbols are only constructed by lines that are easy to remember.
Users can learn how to use this interface easily and quickly.
Usability
According to the three guidelines proposed, the set of finger gestures
can satisfy the users' interactive needs. In addition, the working area
mapping method designed for delivering a digital document makes
this gesture easily and accurately used, especially when the table is
very large and not easy for users to hand documents to each other.
Throwing the document would be considered inaccurate or impre-
cise. Users will benefit from the convenience of the interface.
Naturalness
All of the gestures can be done in the user's own working area, which
makes sharing the digital document experience comfortable. As
we have discussed above, the gestures accomplished by single and
double finger operations are just as what people do in their daily lives
with real paper documents. In addition, the symbols used by finger
trajectory operations are very simple and in accordance with the users'
habits. For example, we use crossed lines to represent the meaning of
deleting. Users will feel comfortable and natural using the interface.
7.6 Conclusion
In this chapter, we study the typical application scenario of the tabletop
system: sharing digital documents on large tabletops among multiple users,
give a user interface design using finger gestures, and explore the design
in the prototype application, JuTable. Novel aspects of our work are: we
propose a systematic design of the user interface for the application scenario
we studied. We then use a finger trajectory operation that provides users
with a more natural interactive paradigm. We design a radar map widget to
deliver the digital document on large tabletops.
 
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