The subject matter of the research is as follows: pension reforms conducted by some states define the transformation of pension systems. The choice of countries is stipulated by the fact that each of them has different types of pension systems and preconditions for reforms. The purpose is to develop an approach that allows comparing and evaluating changes in disparate systems. The hypothesis is that the ongoing pension reforms, regardless of initial conditions and their type lead to a similar trajectory of pension systems development in all countries. The methodology rests on the comparative analysis that was carried out on the basis of a single algorithm that allows to determine significant modifiable parameters and the overall direc...