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In page Ferdinand de Saussure:

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In Europe, the most important work after Saussure's death was done by the Prague school. Most notably, Nikolay Trubetzkoy and Roman Jakobson headed the efforts of the Prague School in setting the course of phonological theory in the decades from 1940. Jakobson's universalizing structural-functional theory of phonology, based on a markedness hierarchy of distinctive features, was the first successful solution of a plane of linguistic analysis according to the Saussurean hypotheses. Elsewhere, Louis Hjelmslev and the Copenhagen School proposed new interpretations of linguistics from structuralist theoretical frameworks.[citation needed]