The splitting method is one of the most powerful and wellstudied approaches for solving various NP-hard problems. The main idea of this method is to split an input instance of a problem into several simpler instances (further simplified by certain simplification rules), such that when the solution for each of them is found, one can construct the solution for the initial instance in polynomial time. There exists a huge number of articles describing algorithms of this type and usually a considerable part of such an article is devoted to case analysis. In this paper we show how it is possible to write a program that given simplification rules would automatically generate a proof of an upper bound on the running time of a splitting algorithm that uses these rules. As an example we report the results of experiments with such a program for the SAT, MAXSAT, and (n,3)-MAXSAT (the MAXSAT problem for the case where every variable in the formula appears at most three times) problems.