This paper presents a study on the handwriting input interfaces for small-size mobile devices. The design of these interfaces has been associated to an experimental evaluation of their qualities from a cognitive psychology point of view. First, we resume the principles of our input interfaces based on our handwritten character recognition system. Then, we describe two experiments that have been conduced and their conclusions. The first concerns the design of an educational software build to allow a fast and efficient start with the interface. The second evaluate the interface quality and focuses on the hypotheses that underlie our design principles.
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