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Language complexity is a hot debated issue, relevant to various areas of linguistics present at the ACLC, e.g. language typology, language evolution, first and second language acquisition, language impairment, corpus and cognitive linguistics. It is a multidisciplinary theme par excellence, which is investigated from different perspectives and (sub)disciplines.

Key objectives

  • Investigating complexity from various perspectives and disciplines, including phraseological, morphological, propositional, phonological and discourse-interactional complexity.
  • Looking for non-redundant, valid and reliable measures of complexity.
  • Establishing developmental measures of complexity.
  • Doing longitudinal and cross-linguistic research on complexity.
  • Doing research on complexity in instructional practice.


The members of the research group meet on a regular basis. During these meetings colleagues from other universities inside and outside the Netherlands are invited to discuss their findings with the group.

Coordinator and group members

Coordination: Folkert Kuiken and Ineke Vedder

Group members: Enoch Aboh, Kees Hengeveld, Petra Sleeman, Klaas Seinhorst, Jacub Szymanik, Thom Westveer

Guests: Margreet Dorleijn, Federico Gobbo, Aafke Hulk, Jan Hulstijn, Caitlin Meyer, Arjen Versloot