 The application of linguistic science to the analysis of speech and language disorders has always been necessary but understudied.Roman Jakobson, a Russian structural linguist, was one of the first to try to apply linguistic theory to the study of Speech-Language Pathology.Published in 1941, his book "Kindersprache, Aphasie und allgemeine Lautgesetze"  recorded the results of his analysis of language use in child language acquisition and in adults with acquired aphasia.