For which group of learners, sign-language method is the most appropriate?

A hearing-impaired person is the one who has difficulty in hearing. For such people, sign languages are used to show them what one is saying. The first person credited with the creation of a formal sign language for the hearing impaired was Pedro Ponce de León, a 16th-century Spanish BENEDICTINE monk. A language that employs signs made with the hands and other movements, including facial EXPRESSIONS and postures of the body is called sign language.But people with disabilities including Autism, Apraxia of speech, Cerebral Palsy, and Down Syndrome may also find sign language BENEFICIAL for communicating.Sign language may be as coarsely expressed as mere grimaces, shrugs, or pointings; or it may employ a delicately nuanced combination of coded manual signals reinforced by facial expression and perhaps augmented by words spelt out in a manual alphabet.Hence, we conclude that for hearing impaired LEARNERS, sign language is the most APPROPRIATE.