- Aphasia patients,
- Persons with facial paralysis,
- Persons with cerebral palsy,
- Persons who use voice prosthesis (Voice prosthesis is for persons whose whole voice box has been surgically removed due to cancer),
- Hearing-impaired persons,
- Stutterers have difficulty speaking.
- To establish effective communication, the place where oral exams, job interviews or meetings take place should be silent.
