Screen Access Screen Contents Spoken Aloud. Aural output is Derived from visual display. Screen Access Design Encapsulate display in an off-screen model. Present this model aurally. Enable navigation of this model.
Aural feedback lacks application context.
Degrades as visual interface gets richer. Misses information implicit in visual layout. Steps 1 and 3 constitute the user interface Speech Enabling Applications Treat speech as a first class medium. Application produces its own feedback. Exploit features of the spoken medium.