Preface International Scientific Symposium «Intelligent Solutions» (IntSol-2021) provides a leading international forum that brings together researchers and practitioners from different fields with the purpose of exploring the fundamental aspects of computational intelligence and decision making theory as practical impacts of information technology in modern world. The collection includes selected papers presented at the 2th International Scientific Symposium «Intelligent Solutions» (IntSol-2021, September 28-30, 2021,Kyiv-Uzhhorod, Ukraine). The purpose of the event is presentation and discussion of the latest scientific results in the field of computer science, information technology, research and development of methodologies, techniques and tools for digital transformations of society on this basis. The conference was held as a video conference using the Zoom platform on 28-30 September. The collection contains main conference papers peer-reviewed and selected by the program committee. Professors and associate professors, sometimes in collaboration with PhD students are the authors of the papers. Leonid Hulianytskyi, Mykola Malyar, Vitaliy Snytyuk, Yuriy Zaychenko, IntSol-2021 Symposium Editors Program Committee of the Conference Peter Bidyuk, Professor, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Kyiv, Ukraine Yevgeniy Bodyanskiy, Professor, Kharkiv National University of Radio, Electronics, Kharkiv, Ukraine Sándor Bozóki, Professor, Computer and Automation Research Institute Hungarian Academy of Sciences, Hungary Leonid Hulianytskyi, Professor, V.M.Glushkov Institute of Cybernetics of the National Academy of Sciences of Ukraine, Ukraine Roth Hubert, Professor, Automatic Control Engineering Institute (RST), Siegen University, Siegen, Germany Stan Lipovetsky, Professor, GfK Custom Research North America, Minneapolis, MN Mykola Malyar, Professor, Uzhgorod NationalUniversity, Uzhgorod, Ukraine Krassimir Markov, Chief, ITHEA Institute of Information Theories and Applications, Bulgaria Nataliya Pankratova, Professor, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Kyiv, Ukraine Ivan Sergienko, Professor, V.M. Glushkov Institute of Cybernetics of the National Academy of Sciences of Ukraine, Ukraine Vitaliy Snytyuk, Professor, Taras Shevchenko National University of Kyiv, Ukraine Mariya Sodenkamp, PhD, Universität Bamberg, Bamberg, Germany Yurii Stoyan, Professor, A.Pidhornyi Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine Vitaliy Tsyganok, Professor, Institute for Information Recording of the National Academy of Sciences of Ukraine Oleksii Voloshyn, Ukraine Professor, Taras Shevchenko National Universityof Kyiv, Ukraine Vladimir Vovk, Professor, Royal Holloway, University of London, United Kingdom Sergey Yakovlev, Professor, National Aerospace University «Kharkov Aviation Institute», Ukraine Yuriy Zaychenko, Professor, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Kyiv, Ukraine Michael Zgurovsky, Professor, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Kyiv, Ukraine The conference is organized by  Taras Shevchenko National University of Kyiv  National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»  Viktor Glushkov Institute of Cybernetics of the National Academy of Sciences of Ukraine  Institute for Information Recording of the National Academy of Sciences of Ukraine  Uzhhorod National University  Cherkasy State Technological University