This study will address the proposed research question: Which factors influence the performance of the firms? To answer that question, an integrative model was developed based on the knowledge produced by the consecrated positioning school and resource-based view. This model says that the firm resources, the strategy adopted by the firm and the industry structure are the factors that influence the performance. In addition, the tree factors cited above are influenced by the environment. This model was, then, tested by the structural equation modeling method Maximum likelihood estimation (MLE) with simulated data. Altogether with the proposed model, two consecrated by literature models were tested. The first one is based on positioning school theories (adopted from Hill & Deeds, 1996) and the second one is based on resource-based view theories (adopted from Schroeder et al., 2002). The poposed model test demonstrated that, although performance is really affected by the tree factors cited above, the fit indicators showed that the model doesn´t represent very well the data used to test it. On the other hand, the two consecrated by literature models had much better fit indicators. It shows that they represent much better the simulated data used to test them with the statistical method used.