In the industries it is quite important to evaluate the parameters of the maintenance system, with the main objective to design continuous improvement plans helping to maintain the operation processes working efficiently. In this respect, the proposed method that we will use in the current research is the multi-criteria decision making named as MOORA. Moreover, we propose an analysis and evaluation for the maintenance system, by using the metric data collected during the process. Such evaluation determines the optimal operation conditions of the machine, and, in the same way one can be able to establish its worse operational conditions; it might help to the management to take into account the best decisions with regard to each machine. The aim of this paper is to tackle the study in the decision making in the industrial area, specifically in the maintenance of molding machines. Finally, an experimental case is developed to validate that the MOORA method is feasible to evaluate the performance of the machines.