Abstract
Row-column scanning, manipulated by one or two special switches, is used for the severely motor disabled. It is desired to reduce switch activations for input letters. In this paper, row-column scanning with an adaptive letter prediction mechanism is described, then it's performance is evaluated by simulation. It is shown that this method is far superior to that of simple row-column scanning, and equal to or slightly better than that of frequency ordered row-column scanning, Huffman coding, both are non-adaptive and using a priori information, and dynamic Huffman coding.
