There are any number of uses to which the analyses presented here can be put. In Australia they have evolved in two main contexts: (i) as a means of exploring the relation between text and context — between text and register, genre and ideology (see Chapter 7 below); and (ii) as one foundation for the development of an educational linguistics, which has been used in particular to focus on literacy development (e.g. Painter and Martin 1986, Hasan and Martin 1989). From the start, this work has been pursued within the framework of critical linguistics (inspired by Fowler et al. 1979, Kress and Hodge 1979, Chilton 1985, Kress 1985/1989, Fowler 1987, Fairclough 1989) — a linguistics which "deconstructs" texts in such a way as to draw attention to the semiotic systems they instantiate, with a view to critically evaluating the ideologies they construe. Observational, descriptive and explanatory adequacy aside, this means that English Text has been written as a contribution to the linguistics envisioned by Halliday (1985e:5) as "an ideologically committed form of social action." For this reason it needs in part to be read in the context of projects oriented to de-naturalising hegemonic discourses and, concomitantly, facilitating intervention in political processes (e.g. Poynton 1985/1989, Martin 1985b/1989, Threadgold et al. 1986, Christie 1991, Giblett and O'Carrol 1990, and the new journal Social Semiotics).
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[1] To be clear, in SFL Theory, the relation between text and context is the realisation relation between an instance of language (text) and an instance of context (situation). Martin, however, misunderstands varieties of language, register and genre, as not language, but the context of language. This is analogous to claiming that varieties of dog, such as Rottweiler and Retriever, are not dogs, but the context of dogs.
In SFL Theory, register is the midway point on the cline of instantiation — for the content plane of language — viewed from the system pole, and genre (in sense of text type) is the same point viewed from the instance pole. That is, register and text type are complementary perspectives on the same phenomenon: functional varieties of language.
… linguistics cannot be other than an ideologically committed form of social action.