Following Roman Jakobson, he expanded the scope of the semiotic study of translation to include intratextual, intertextual, and extratextual translation and stressing the productivity of the notion of translation in general semiotics.
Building on Roman Jakobson's work, he expanded the field of semiotic study to include translations within texts, between texts, and outside of texts, highlighting the innovative power of translation in broader semiotic contexts.