Nemak, a Mexican enterprise devoted to the production of engine cylinder heads and blocks a market leader on the industry, tries to identify critical external factors to gain competitive advantage as well as to understand their influence on its overall performance in order to face the challenges of the global economy. This paper presents the use of Balanced Scorecard based on a System Dynamics model that intends to be a decision-making tool for the company. The model is able to generate behavior trends on several different scenarios.