Structuralism as a term 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.[1] Although Saussure also made use of this analogy, structural linguistics is mainly associated with his notion of language as a dual interactive system of signs and concepts. The terms structure and structuralism were adopted to linguistics by the Prague school linguists Roman Jakobson and Nikolai Trubetzkoy; while the term structural linguistics was coined by Louis Hjelmslev.[3]