The article presents a model giving consideration to probability nature of the transition from one stage to another based on the conceptual approach to understanding stress as stages: an alarm reaction, resistivity and exhaustion stages suggested by H. Selye. The author examined some features of its formalization in the framework of open system theory. The arguments for analytical expressions determining probability nature of the transition from one stress condition to another have been presented. The author determined time intervals of the transition to a resistivity stage depending on the stress tolerance index of a subject. The article gives factors establishing stress parameters in terms of its destructive impact upon a subject. The author suggested an analytical framework providing probability assessment indicating the presence of a subject at a certain stage of a stress condition. The article suggests some ways to apply the results obtained.

Dvornikova Olga Fedorovna, Psychologist, The Bonch-Bruevich, St. Petersburg State University of Telecommunications, 22/1, Bolshevikov ave., Saint Petersburg, 193232, Russian Federation, e-mail: olga.dvornikova.68@mail.ru

Dvornikov Sergey Viktorovich, Doctor of Sciences (Technical), Professor, Department of Radio Engineering and Optoelectronic Complexes, St. Petersburg State University of Aerospace Instrumentation, 67 А, Bolshaya Morskaya st., Saint Petersburg, 190000, Russian Federation Professor of the Radio Communication Department, Military Academy of Communications named after Marshal of the Soviet Union S. M. Budyonny, 3, Tikhoretsky prospect, Saint Petersburg, 194064, Russian Federation, e-mail: practicdsv@yandex.ru

Hudyakov Andrey Ivanovich, Doctor of Sciences (Psychology), Professor, Department of Psychology of Professional Activity, Herzen University, 48, Moika river emb., Saint Petersburg, 191186, Russian Federation, e-mail: haipsy@yandex.ru

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