Another linguistic theory of communication favored in CLT is Halliday's functional account of language use. "Linguistics ... is concerned... with the description of speech acts or texts, since only through the study of language in use are all the functions of language, and therefore all components of meaning, brought into focus" (Halliday 1970: 145). In a number of influential books and papers, Halliday has elaborated a powerful theory of the functions of language, which complements Hymes's view of communicative competence for many writers on CLT (e.g., Brumfit and Johnson 1979; Savignon 1983). He described (1975: 11-17) seven basic functions that language performs for children learning their first language: