Speech impairments  alone generally do not interfere with most computer use. However, advanced computer-based speech synthesizers are close enough to human quality to act as substitute voices and thus provide a compensatory tool for students who cannot communicate verbally. Students with portable systems can participate in class discussions once adapted computers provide them with intelligible speaking voices.
For more information, consult the DO-IT publications, Working Together: People with Disabilities and Computer Technology, Working Together: Computers and People with Sensory Impairments, and Technology and Universal Design.
-  Speech impairments