Editing Dasher (software) (section)

==Design==
For whatever the writer intends to write, they select a letter from ones displayed on a screen by using a pointer, whereupon the system uses a [[probability|probabilistic]] predictive [[scientific modeling|model]] to [[prediction by partial matching|anticipate]] the likely character combinations for the next piece of text, and accord these higher priority by displaying them more prominently than less likely letter combinations. This saves the user effort and time as they proceed to choose the next letter from those offered.  The process of composing text in this way has been likened to an [[arcade game]], as users zoom through characters that fly across the screen and select them in order to compose text. The system learns from experience which letter combinations are the most popular, and changes its display protocol over time to reflect this.