There is necessity to make efficient organizations and to use the resources rationally, as well as a responsibility of saving energetic resources in order to satisfy a more and more demanding, conscious and prepared client. This has caused the need to a change in the paradigm related to empirical decisions, considering the experience of the involved personnel, toward a quantitative focus, where the solutions that model rationally the way of acting of the person who takes the decisions, are obtained. In this work is showed the conception of a procedure for the using of quantitative tools that support the decision-making process in business, and also are exposed the premises and requirements for its application, as well as the different phases and steps that compose it. This procedure was validated when it was applied in order to solve problems at a creole food restaurant and at a safety and protection services company, obtaining an improvement on all the indicators that were analyzed.