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Joanna Helga

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Publications by Joanna Helga (bibliography)

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2011
 
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MacKenzie, I. Scott, Soukoreff, R. William and Helga, Joanna (2011): 1 thumb, 4 buttons, 20 words per minute: design and evaluation of H4-writer. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 471-480.

We present what we believe is the most efficient and quickest four-key text entry method available. H4-Writer uses Huffman coding to assign minimized key sequences to letters, with full access to error correction, punctuation, digits, modes, etc. The key sequences are learned quickly, and support eyes-free entry. With KSPC = 2.321, the effort to enter text is comparable to multitap on a mobile phone keypad; yet multitap requires nine keys. In a longitudinal study with six participants, an average text entry speed of 20.4

© All rights reserved MacKenzie et al. and/or ACM Press

 
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User Experience and Experience Design !

 
 

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The Social Design of Technical Systems: Building technologies for communities. 2nd Edition
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start reading
 
 
 
 
The Encyclopedia of Human-Computer Interaction, 2nd Ed.
by Mads Soegaard and Rikke Friis Dam
start reading