When a person couldn't voice say correctly. Can't speak smoothly. Or there is a problem with their own voice. Treats people with impaired speech (Speech Impairment).Or abnormalities in pronunciation (Articulation Disorders) including speaking on different (Stuttering) at the same time when personally problems in perception and understanding of language. (Receptive language) or skill in the use of language impairment (Expressive language).(Language Impairment) the adults and children can suffer from impaired speech and language. The cause of the defects can be caused by disorders of the body. Or may cause cannot be identified clearly.However, it may be classified into 4 main types according to the features of the disorder include