The tighter competition among the companies inside the autoparts industry brings challenges to the ones that intend to remain and grow in this market. One alternative that appears as an option to generate a competitive advantage is the stablishment of strategic alliances among companies inside this market. The current research has the goal to contribute to the studies in startegic management of firms inserted in alliances, focusing in the question of its strategic implications over its performance. Has as focus the company Forjas Brasileiras, a brazilian company that in 1999 decided to stablish two strategic alliances with foreign companies. With the use of case study methodology of Yin (1994) and the triangulatioin of methods strategy, data was collected by way of documental/telematicinvestigations as well as survey and in-depth interviews. Data interpretaion ans analysis was carried out in the light of the theoretical references that were stablished on the basis of the results of the literature review, with the support of Macedo-Soares´ systemic and integrative model in its traditional and relational models. The results of the research showed the importance to use relational model in the case of companies that have stablished alliances, so these view might bring new insights to the strategic decision in the firm, wich could not be achieved by means of traditional analysis.