BibTeX
@inproceedings@inproceedings{Soukoreff:gi2003:ILM, title = {Input-Based Language Modelling in the Design of High Performance Text Input Techniques}, author = {R. William Soukoreff and I. Scott MacKenzie}, booktitle = {Proceedings of the Graphics Interface 2003 Conference, June 11-13, 2003, Halifax, Nova Scotia, Canada}, organization = {CIPS, Canadian Human-Computer Communication Society}, publisher = {Canadian Human-Computer Communications Society and A K Peters Ltd.}, issn = {0713-5424}, isbn = {1-56881-207-8}, location = {Halifax, Nova Scotia}, url = {http://graphicsinterface.org/wp-content/uploads/gi2003-11.pdf}, year = {2003}, month = {June}, pages = {89--96} }
Abstract
A new technique to enter text using a mobile phone keypad, Less-Tap, is described. The traditional touch-tone phone keypad is ambiguous for text input because each button encodes 3 or 4 letters. As in Multitap, our method requires the user to press buttons repeatedly to get a required letter. However, in Less-Tap, letters are rearranged within each button according to their frequency. This way, the most common letters require only one key press. Unlike dictionary based methods, Less-Tap facilitates the entry of arbitrary words. Unlike LetterWise and T9, Less-Tap allows entering text without having to visually verify the result, after some initial training. For English, Less-Tap requires an average of 1.5266 keystrokes per character (vs. 2.0342 in Multitap). We conducted a user study to compare Less-Tap against Multitap. Each participant had three 20-minute sessions with each technique. The mean entry speed was 9.5% higher with the new technique.