The Department is the main participant in the joint research projects between IMI—BAS and the following academies and universities:

Latvian Academy of Sciences, Latvia Culture college at Latvian  Academy of Culture, joint research project Digital libraries implementation in culture and education (2015-2017, coordinated by Radoslav Pavlov)

Hungarian Academy of Sciences, Computer and Automation Research Institute (SZTAKI), joint research project Development of Software Systems for Multimedia and Language Technologies (since 1986, coordinated by Radoslav Pavlov)

Polish Academy of Sciences, Institute of Slavic Studies, joint research project Semantics and Contrastive Linguistics with a Focus on a Bilingual Electronic Dictionary (since 2006, coordinated by Ludmila Dimitrova)

Russian Academy of Sciences, Institute for Problems of the Transmission of Information, joint research project Research of Models and Software Tools for Language Technologies (2012–2014, coordinated by Radoslav Pavlov and Ivan Derzhanski)

Slovak Academy of Sciences, Ľudovít Štúr Institute of Linguistics, joint research project Electronic Corpora – Contrastive Study with Focus on Design of Bulgarian-Slovak Digital Language Resources (2006-2016, coordinated by Ludmila Dimitrova)

Czech Academy of Sciences, Content Presentation and Services Integration in Czech and Bulgarian Digital Mathematical Libraries (2011–2013, coordinated by Radoslav Pavlov and Peter Stanchev)

Taras Shevchenko National University of Kyiv, Institute of Philology, contract for cooperation with IMI--BAS (2012–2017)

National Academy of Sciences of Ukraine, Ukrainian Lingua-Information Fund, Research and Developments in the Domain of Bulgarian-Ukrainian Electronic Digital Resources (2008–2011, coordinated by Ivan Derzhanski)

Russian Academy of Sciences, Institute for Problems of the Transmission of Information, joint research project Research on Methods and Tools for Language Technologies (2006–2011, coordinated by Ivan Derzhanski)

Hungarian Academy of Sciences, Computer and Automation Research Institute (SZTAKI), joint research project Mathematical Problems of Informatics (1978–2009, coordinated by Radoslav Pavlov)

USA—National Science Foundation, Carnegie Mellon University, joint research project Generic Task of Knowledge Discovery (1997–1998, coordinated by Vladimir Pericliev)

Russian Academy of Sciences, Computing Centre of the RAS, joint research project Distributed Artificial Intelligence (1996–1998, coordinator from IMI Sviatoslav Braynov)

Slovak Academy of Sciences, joint research project Artificial Intelligence – Natural Languages Processing (1989–1990, coordinated by Radoslav Pavlov)

University of Hamburg, joint research project Theoretical Informatics - Computational Linguistics and Artificial Intelligence (1990–1993, coordinated by Radoslav Pavlov and Ruslan Mitkov)

Centre National de la Recherche Scientifique (LIMSI), Université Paris 7 (Laboratoire de Linguistique Formelle), joint research project Mathematical and Computational Linguistics and Applications (1991–1993, coordinated by Radoslav Pavlov)

Academy of Sciences of DDR, Central Institute of Linguistics, joint research project Methodological Problems of Grammar, Semantics, and Lexicography (1981–1985, coordinated by Radoslav Pavlov)

Hungarian Academy of Sciences, Computer and Automation Research Institute (SZTAKI), joint research project Mathematical Cybernetics and Data Bases (1978–1985, coordinated by Radoslav Pavlov)

Academy of Sciences of DDR, Central Institute of Linguistics, joint research project Semantics Criteria and Structure (1979–1980, coordinated by Radoslav Pavlov).