Most papers published in this Special Issue of Mathematics are written by the participants of the XXXVI International Seminar on Stability Problems for Stochastic Models, 21-25 June, 2021, Petrozavodsk, Russia. The scope of the seminar embraces the following topics: - Limit theorems and stability problems; - Asymptotic theory of stochastic processes; - Stable distributions and processes; - Asymptotic statistics;...