Toward the problem of estimation of the complex software system reliability

Article is devoted to the problem of software reliability estimation. The developed algorithm allows applying universal model for estimation the reliability parameters of software systems with different architectures. The modification of the model for estimation of the reliability of distributed multiversion software systems is given. Based on the proposed models and algorithm the program complex is developed. The paper presents the research of the dependence of various reliability parameters of a software system from the conditional and unconditional probability of failure of individual system components, as well as from the number of components of the software system.