Structural linguistics is an approach to linguistics originating from the work of Swiss linguist Ferdinand de Saussure and is part of the overall approach of structuralism. Structural linguistics involves collecting a corpus of utterances and then attempting to classify all of the elements of the corpus at their different linguistic levels: the phonemes, morphemes, lexical categories, noun phrases, verb phrases, and sentence types.
De Saussure's Course in General Linguistics, published posthumously in 1916, stressed examining language as a static system of interconnected units. He is thus known as a father of modern linguistics for bringing about the shift from diachronic (historical) to synchronic (non-historical) analysis, as well as for introducing several basic dimensions of semiotic analysis that are still important today, such as syntagmatic and paradigmatic analysis (or 'associations' as Saussure was still calling them).
Two of Saussure's key methods were syntagmatic and paradigmatic analysis, which define units syntactically and lexically, respectively, according to their contrast with the other units in the system.
Structural linguistics begins with the posthumous publication of Ferdinand de Saussure's Course in General Linguistics in 1916, which was compiled from lectures by his students. The book proved to be highly influential, providing the foundation for both modern linguistics and semiotics. Structuralist linguistics is normally seen as giving rise to independent European and American traditions.