Development of a Digram-based typing key layout for single-finger/stylus input

摘要

Hand-held devices often include a keyboard on which a user types which one finger or a stylus. When a user types with one finger, conventional key layouts are not optimal for typing throughput. We used a predictive human performance model based on the frequency of English-language digrams and interkey distances to evaluate alternative key layouts. We also analyzed English digrams with a path-analysis program to determine the strongest links among English letters. The path analysis combined with the predictive human performance model provided a basis for developing and evaluating typing-key layouts for single-finger input. A nonstandard typing-key layout (in a roughly 5 x 5 key matrix) based on digram analysis should, after the development of skiilled use, be about 27 percent better than the QWERTY layout. A nonstandard alphabetic typing-key layout (in a roughly 5 x 5 key matrix) should be about 13 percent better than the QWERTY layout for single-finger entry.