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Hearing is an essential part of man's ability to communicate - and it is speech communication and the complex ideas that speech can represent that separate man from the other animals. Audiology the science of hearing, particularly diagnostic testing and the study of impaired hearing that cannot be improved by medication or surgical therapy. It is considered to be the study and assessment of hearing and balance and the treatment and prevention of disorders of these functions. It contains a diverse collection of scientific, technical, clinical and re-habilitational disciplines, which together represent the complex whole.