Prague linguistic circle in the context of "Michael Halliday"

Course in General Linguistics (French: Cours de linguistique générale) is a book compiled by Charles Bally and Albert Sechehaye from notes on lectures given by historical-comparative linguist Ferdinand de Saussure at the University of Geneva between 1906 and 1911. It was published in 1916, after Saussure's death, and is generally regarded as the starting point of structural linguistics, an approach to linguistics that was established in the first half of the 20th century by the Prague linguistic circle. One of Saussure's translators, Roy Harris, summarized Saussure's contribution to linguistics and the study of language in the following way:

Although Saussure's perspective was in historical linguistics, the Course develops a theory of semiotics that is generally applicable. A manuscript containing Saussure's original notes was found in 1996, and later published as Writings in General Linguistics.

Structural linguistics, or structuralism, in linguistics, denotes schools or theories in which language is conceived as a self-contained, self-regulating semiotic system whose elements are defined by their relationship to other elements within the system. It is derived from the work of Swiss linguist Ferdinand de Saussure and is part of the overall approach of structuralism. Saussure's Course in General Linguistics, published posthumously in 1916, stressed examining language as a dynamic system of interconnected units. Saussure is also known for introducing several basic dimensions of semiotic analysis that are still important today. Two of these are his key methods of syntagmatic and paradigmatic analysis, which define units syntactically and lexically, respectively, according to their contrast with the other units in the system. Other key features of structuralism are the focus on systematic phenomena, the primacy of an idealized form over actual speech data, the priority of linguistic form over meaning, the marginalization of written language, and the connection of linguistic structure to broader social, behavioral, or cognitive phenomena.

Structuralism as a term, however, was not used by Saussure, who called the approach semiology. The term structuralism is derived from sociologist Émile Durkheim's anti-Darwinian modification of Herbert Spencer's organic analogy which draws a parallel between social structures and the organs of an organism which have different functions or purposes. Similar analogies and metaphors were used in the historical-comparative linguistics that Saussure was part of. Saussure himself made a modification of August Schleicher's language–species analogy, based on William Dwight Whitney's critical writings, to turn focus to the internal elements of the language organism, or system. Nonetheless, structural linguistics became mainly associated with Saussure's notion of language as a dual interactive system of symbols and concepts. The term structuralism was adopted to linguistics after Saussure's death by the Prague school linguists Roman Jakobson and Nikolai Trubetzkoy; while the term structural linguistics was coined by Louis Hjelmslev.

The Moscow linguistic circle was a group of social scientists in semiotics, literary theory, and linguistics active in Moscow from 1915 to ca. 1924. Its members included Roman Jakobson (its founder), Filipp Fortunatov, Grigoriy Vinokur, Boris Tomashevsky, and Petr Bogatyrev. The group was a counterpart to the St. Petersburg linguistic group OPOJAZ; between them, these two groups (together with the later Prague linguistic circle) were responsible for the development of Russian formalist literary semiotics and linguistics.