Competence Versus Performance
Further information: Linguistic performance"Linguistic theory is concerned primarily with an ideal speaker-listener, in a completely homogeneous speech-community, who knows its (the speech community's) language perfectly and is unaffected by such grammatically irrelevant conditions as memory limitations, distractions, shifts of attention and interest, and errors (random or characteristic) in applying his knowledge of this language in actual performance." ~Chomsky,1965
Chomsky differentiates competence, which is an idealized capacity, from performance being the production of actual utterances. According to him, competence is the ideal speaker-hearer's knowledge of his or her language and it is the 'mental reality' which is responsible for all those aspects of language use which can be characterized as 'linguistic'. Chomsky argues that only under an idealized situation whereby the speaker-hearer is unaffected by grammatically irrelevant conditions such as memory limitations and distractions will performance be a direct reflection of competence. A sample of natural speech consisting of numerous false starts and other deviations will not provide such data. Therefore, he claims that a fundamental distinction has to be made between the competence and performance.
Chomsky dismissed criticisms of delimiting the study of performance in favor of the study of underlying competence, as unwarranted and completely misdirected. He claims that the descriptivist limitation-in-principle to classification and organization of data, the "extracting patterns" from a corpus of observed speech and the describing "speech habits" etc. are the core factors that precludes the development of a theory of actual performance.
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