Novikov, B.V.Perepelytsya, I.D.Zholtkevych, G.M.2011-05-072011-05-072011-04-27Proceedings of the 7th International Conference on ICT in Education, Research and Industrial Applications: Integration, Harmonization and Knowledge Transfer (ICTERI 2011), Kherson, Ukraine, May 4-7, 2011. - P. 41 - 50ISSN 1613-0073https://ekhnuir.karazin.ua/handle/123456789/2567The new class of recognisers is introduced and studied in the paper. The models are based on the notion of partial action of a free nite generated monoid. Authors called such models by preautomata. Some properties of preautomata were established and proved in the paper. These properties allow to consider the pre-automata as mathematical models of recognizers of event ows in processes of the interaction of software systems.enDiscrete MathematicsTheoretical Computer ScienceArticle