This paper proposes a text entry device which does not use
a fixed keyboard. Instead, it employs recently-developed adaptive techniques
to display on a VDU predictions of the text the user is about to
enter. One of these predictions is selected by the user using a suitable
pointer technology. Design considerations for the system, and
experience with one of its precursors, are discussed. Simulations are
described which illustrate how the device will behave in practice.
The use of an adaptive model of the text allows the system to predict
on the basis of the language and vocabulary actually used in the text
entered so far, and the model changes dynamically during the entry
process. If desired, a sequence of typical text could be used to prime
the device. Some possible applications and extensions include the
graceful integration of spelling and syntax checkers into the predictive
process, and hence into the reactive keyboard itself.
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