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ACM Transactions on Computer-Human Interaction (TOCHI)
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In this paper we describe a specialized keyboard for text entry that maps four rows of a standard keyboard onto the home row, with different characters encoded via modifier keys and multi-tap input. Use of the keyboard also relies on lexicon-based disambiguation. This design has two motivations: limiting physical space requirements and capitalizing on user knowledge of the standard QWERTY keyboard layout. The resulting "stick" keyboard is between 15% and 25% of the size of a standard keyboard. In a preliminary empirical study, users reached half of their normal typing speed using lexicon-based disambiguation (22.5 wpm) and a reasonable but lower speed with multi-tap input (10.4 wpm) with only a few minutes of practice.