 It refers to the description and classification of pragmatic impairments, their elucidation in terms of various pragmatic, linguistics, cognitive and neurological theories, and their assessment and treatment.In corpus linguistics, discourse refers to the study of language expressed in corpora (samples) of “real world” text, the codified language of a field of enquiry, or a statement that determines the connections among language and structure and agency.Linguistic concepts and theories are applied to assess, diagnose and administer language disorders.