Competence (linguistics)

Linguistic competence is the system of linguistic knowledge possessed by native speakers of a language. It is distinguished from linguistic performance, which is the way a language system is used in communication. Noam Chomsky introduced this concept in his elaboration of generative grammar, where it has been widely adopted and competence is the only level of language that is studied.

According to Chomsky, competence is the ideal language system that enables speakers to produce and understand an infinite number of sentences in their language, and to distinguish grammatical sentences from ungrammatical sentences. This is unaffected by "grammatically irrelevant conditions" such as speech errors. In Chomsky's view, competence can be studied independently of language use, which falls under "performance", for example through introspection and grammaticality judgments by native speakers.

Many other linguists – functionalists, cognitive linguists, psycholinguists, sociolinguists and others have rejected this distinction, critiquing it as a concept that considers empirical work irrelevant and left out many important aspects of language use. Also, it has been argued that the distinction is often used exclude real data that is, in the words of William Labov "inconvenient to handle" within generativist theory.

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.

...
Wikipedia